Rebecca had trouble conceiving. Isaac and Rebecca prayed for children, and after twenty years of marriage Rebecca became pregnant. She was concerned about her exceedingly difficult pregnancy, and was advised by G‑d that this was due to two children – two nations – struggling in her womb. She gave birth to twin boys: a hairy, ruddy boy named Esau, and a second son, born clutching his brother's heel, named Jacob. Esau became a hunter, while Jacob was an honest man who frequented the schools of Torah. Isaac favored Esau, while Rebecca preferred Jacob. One day, Esau came home from the field hungry, and pleaded with Jacob to give him some of the stew he was cooking. Jacob agreed to Esau's request provided that he give him his birthright as firstborn in exchange—and Esau acceded to this barter. There was a famine in Canaan, and Isaac was escaping the famine by traveling to Egypt via Philistine when G‑d told him to remain in Philistine. G‑d also informed Isaac that he would visit upon him all the blessings He had promised to Abraham.