John Wesley on Genesis 20:13

When God caused me to wander from my father's house - Then we settled this matter. It may be, that God denied Abraham and Sarah the blessing of children so long to punish them for this sinful compact they had made to deny one another: if they will not own their marriage, why should God own it? But we may suppose, that alter this reproof they agreed never to do so again, and then presently we read, Ge 21:1,2, that Sarah conceived.