When God Investigates Your Faith

In Genesis 18, God visits Abraham at the tree of Mamre after the completion of the covenant of circumcision which was enacted by God in Genesis 17. Three visitors, sent by God, also visit with Abraham and Sarah. One of the visitors inquire about Sarah and once again declare that Sarah shall have a son in about a year. The declaration is then made again has a confirmation of the will of God. Sarah reacts by laughing which denotes absolute doubt. Sarah's faith had declined and God sent the three angels to affirm Sarah's faith.