Genesis 25:21

25:21 Isaac prayed to ¹  the Lord on behalf of his wife because she was childless. The Lord answered his prayer, and his wife Rebekah became pregnant.

Genesis 30:38

30:38 Then he set up the peeled branches in all the watering troughs where the flocks came to drink. He set up the branches in front of the flocks when they were in heat and came to drink. ² 

¹ tn The Hebrew verb עָתַר (’atar), translated “prayed [to]” here, appears in the story of God’s judgment on Egypt in which Moses asked the Lord to remove the plagues. The cognate word in Arabic means “to slaughter for sacrifice,” and the word is used in Zeph 3:10 to describe worshipers who bring offerings. Perhaps some ritual accompanied Isaac’s prayer here.

² sn He put the branches in front of the flocks…when they came to drink. It was generally believed that placing such “visual aids” before the animals as they were mating, it was possible to influence the appearance of their offspring. E. A. Speiser notes that “Jacob finds a way to outwit his father-in-law, through prenatal conditioning of the flock by visual aids – in conformance with universal folk beliefs” (Genesis [AB], 238). Nevertheless, in spite of Jacob’s efforts at animal husbandry, he still attributes the resulting success to God (see 31:5).