In the first reading (, aliyah), Isaac was 40 years old when he married Rebekah, and when she proved barren, Isaac pleaded with God on her behalf, and God allowed Rebekah to conceive [REF].
In the second reading (, aliyah), Isaac settled in Gerar, and when the men of Gerar asked Isaac about his beautiful wife, he said that she was his sister out of fear that the men might kill him on account of her [REF].