Genesis 15:16

“And in the fourth generation they shall come hither again, etc.] The seed of Abram were in the land of Canaan before their descent into Egypt; and it is here predicted and promised, that they should come thither again, as they did, in the fourth generation of those that descended thither; for Moses and Aaron were the fourth from Levi, or Eleazar from Kohath, and Caleb from Judah; or rather this was in the fourth age or century from the birth of Isaac, when the four hundred were up before mentioned, men living at that time about an hundred years: Grotius interprets this of the fourth generation of the Amorites, because of what follows: for the iniquity of the Amorites [is] not yet full; and…”

“- The Faith of Abram 1. דבר dābār, “a word, a thing;” the word being the sign of the thing. 2. אדני 'ǎdonāy, “Adonai, the Lord;” related: “bring down, lay down.” This is the name usually read in place of Yahweh; but when, as in the present case, יהוה yehovâh and אדני 'ǎdonāy are in apposition, אלהים 'ĕlohı̂ym is read instead of the former. The Jews from a feeling of reverence avoided the utterance of this sacred name except on the most solemn occasions. This is said to have arisen from a stringent interpretation of Leviticus 24:16. According to some, this name was pronounced only once a year by the high priest, on the day of atonement, in the Holy of Holies, and according to others…”

“15:16 The reasons for Israel’s bondage included God’s justice. God would tolerate the sins of the Amorites until they fully deserved judgment. • do not yet warrant their destruction (literally are not yet full): To give the Promised Land to Israel, the Lord would dispossess the land’s inhabitants in a way that satisfied his justice. The fulfillment of promises to Israel also brought retributive judgment on people of the land (though individuals were saved by faith; see Josh 2:1-15; 6:23-25; Heb 11:31; Jas 2:25). Until then, God would send the family to Egypt where Israel could become a great nation. Seeing all this in advance was terrifying (Gen 15:12), but it was comforting to know that…”