'ויאמר אליו אני ה, He said to him: "I am the Lord;⁠" everything from the opening line of the chapter, "it was after these events" had been said to Avram at night, in a dream. This is clear from the word: במחזה, "in a vision,⁠" (verse 1). In verse five Avram is told: "and count the stars;⁠" from that point on we have the paragraph known popularly as ברית בין הבתרים, "the covenant between the cut up pieces.⁠"From then on we have a revelation Avram experienced in daylight, as the paragraph concludes with the words: "it was when the sun was about to set;⁠" (verse 12) This revelation by daylight had preceded the passagecommencing with chapter 15,1 by five years. This is clear from when God told Avram that "your descendants will be strangers and slaves for 400 years in a land that is not their own.⁠" In Exodus 12,41 the Torah reports that the Israelites had dwelled in Egypt for 430 years, i.e. that the prophecy made to Avraham had now been fulfilled. According to this,Avraham did not have any child by Sarah (i.e. Yitzchok) until 30 years after this first revelation. The Torah had stated specifically that Avraham was 100 years old when his son Yitzchok was born (Genesis 20,5). In other words, Avram was 70 years old when he left Charan for the first time and when God first told him about the future including his descendants until they would be freed from slavery. When God addressed Avram for the second time and told him to sever his relationship with home and hearth and birthplace in Genesis 12,1, he was 75 years old. According to the well known historic record known as seder olam, Avram was 48 years old at the time of the Tower and the dispersal of mankind. This was followed by the 13 years that the region known as the land of Canaan served and subsequently rebelled against Kedorleomer, a rebellion which lasted 13 years. (Not the 13th year as usually assumed). According to this calculation 26 years had elapsed at that time from when the Tower had been destroyed. If you add these years to the 48 years Avram had lived before that traumatic event was 74 or 75 years old. This is referred to when the Torah stated that Avram was 75 years old when he left Charan permanently. Immediately after Avram had defeated the kings mentioned in chapter 14, God appeared to him and ordered him to leave Charan and to proceed towards the Land of Canaan, his father's original destination when he had left Ur Casdim. The reason why the two paragraphs here were inserted in the Torah as if they had occurred almost simultaneously was so that the promise that Avraham would have biological offspring would appear in direct connection with the promise that Avraham's descendants would inherit the land of Canaan as their ancestral heritage when the time would be ripe for that. The Talmud in B'rachot 7, states specifically that these two visions referred to distinctly different subjects. The newsworthy development in Avram's personality in the intervening between God having spoken to him five years earlier at the covenant between the "pieces,⁠"is that for the first time a human being addressed the Almighty with the title adonav. My Master (8). If you were to think that all that is written here in this chapter is part of a single revelation, and a single subject, up to verse 1 in chapter 16, why did the Talmud not consider verse 2 in chapter 15 in which Avram addressed him by the same title, as the first time in history that this had ever occurred? Clearly what Avram said in verse 8 had preceded what is quoted as having said in verse 2. Furthermore, if these paragraphs had been written in chronological order, how could Avram have dared ask God for a sign that His promise would come true without his being accused as having been lacking in faith? God, after all, had already clearly stated that his heir would be his biological heir (verse 4). It is therefore clear beyond doubt that in this chapter we are dealing with two different revelations, each one dealing with a different subject. Having said all this, it is easy to understand that God referred to the fact that it was He Who had taken him out of Ur Casdim in order to give to his descendants (equated with him) this land that he is to proceed to. Avraham's question that seeing that he had no heir as yet, surely he by himself could not "inherit" this land, (verse 7) was quite logical. After all he had no assurance that he would not die before God's promise having a chance at being fulfilled. It also explains why God, in verse 15, tells him not to worry, but that he would die at a ripe old age. [The only person ever having been given such a promise by God, I believe. Ed.] This promise by God is evidence of what had prompted his question, certainly was not lack of faith. Some people accept Rashi's interpretation that Avram, while certainly not doubting God's promise or ability to deliver on His promise, was concerned that seeing that all of God's promises are based on certain underlying conditions, and he was afraid that some of these might not be met so that God would not be bound by His promise. We have evidence of fulfillment of God's promises being delayed after the sin of the spies, when God swore an oath that all the adults involved in that sin would not set foot in the Holy Land. (Numbers 32:10-11) According to the exegetes claiming that Avram did not doubt God's promise, but wished to know by what merit it would be fulfilled, why would he have been punished for having asked such a question? We would have to answer that the words: ידוע תדע, understood by some as the punishment, i.e. the delay in the fulfillment of God's promise, was not a punishment at all, but a direct answer, meaning that until the time came when in the desert the Israelites would regularly offer up sacrifices, they would indeed not yet have earned that merit. This merit coupled with the suffering during exile in Egypt combined, would suffice to make God replace the Canaanites and give the land to the Israelites.