“the land that I gave.” This is the second time God promises the land to Jacob and his descendants; the first was Genesis 28:13. God repeated the promise that He would give the land of Israel to Abraham and his descendants many times, and said it in slightly different ways. He told Abraham that he and his descendants would get the land (Gen. 12:7; 13:15-17; 15:7, 18; 17:8). He told it to Isaac (Gen. 26:3). He told it to Jacob (Gen. 28:13; 35:12; 48:4). Then over and over He told Israel about the promise or that He would give them the land (cp. Exod. 6:4, 8; 12:25; 13:5, 11; Lev. 14:34; 20:24; 23:10; 25:2).
[For more on the promise God made to give the land to Abraham and his descendants, see commentary on Genesis 15:18.]