Genesis 17:19
Sarah <08283> [Sarah.]
Isaac <03327> [Isaac.]
{Yitzchak,} which we change into Isaac, signifies laughter; in allusion to Abraham's laughing, ver. 17. By this Abraham did not express his unbelief or weakness of faith, but his joy at the prospect of the fulfilment of so glorious a promise; and to this our Lord evidently alludes, Joh 8:56.
Genesis 17:21
covenant <01285> [my.]
set time <04150> [at.]
