God: Gen 17:17, Gen 18:12-15; 1Sa 1:26-28, 1Sa 2:1-10; Psa 113:9, Psa 126:2; Isa 49:15, Isa 49:21; Isa 54:1; Luk 1:46-55; Joh 16:21-22; Gal 4:27-28; Heb 11:11
to laugh: Sarah most likely remembered the circumstance mentioned in Gen 18:12; and also the name Isaac, which implies laughter.