Ramban on Genesis 13:1/רמב"ן על בראשית י״ג:א׳

1HE, AND HIS WIFE, AND ALL THAT HE HAD. The purport thereof is to let us know that they did not rob him of any of all the great gifts they gave him on account of Sarah who was to be for the king. They did not say, “You have tricked us, and the gift was given by mistake.” This was a miraculous event.