Bereshis 18:12-14

Orthodox Jewish Bible

¹² Therefore Sarah laughed [titzchak, sounds like Yitzchak] within herself, saying, After I am grown old shall I have pleasure, adoni being old also?

¹³ And Hashem said unto Avraham, Why did Sarah laugh, saying, Shall I which am old of a surety bear a child?

¹⁴ Is any thing too hard for Hashem? At the time appointed I will return unto thee, in due season, and Sarah shall have ben (son).