She is my sister; she is the daughter of my father, but not the daughter of my mother.
13 I ask Sarah to tell people she is my sister when we are away from home.
14-16 Abimelech gave Sarah back to Abraham, along with sheep, oxen, slaves, and a thousand pieces of silver.
God opens all the wombs in Abimelech's house
17-18 Abraham prayed to God and God healed Abimelech, and his wife, and his female slaves, so that they all bare children. (God had "closed all the wombs" in Abimelech's house, because he believed Abe's lie about Sarah.)
A few more words about this episode
She's my sister (v.2)
The first time Abraham used the "she's my sister" lie, Sarah was about 65 years old. This time she is about 90 years old - but still looking good. So good, in fact, that it wasn't safe for Abraham to he her husband. Men would kill him to get her. So he lied again to save himself (and let Sarah be taken by another man).
You are a dead man (v.3)
God gets angry with king Abimelech, though the king hasn't even touched Sarah. He appears to the king in a dream, threatening to kill him and all of his people.