And he received the sign of circumcision as a seal of the righteousness that he had by faith while still uncircumcised. This was to make him the father of all who believe but are not circumcised, so that righteousness may be credited to them also.
Abraham fell facedown. Then he laughed and said to himself,“ Can a child be born to a hundred-year-old man? Can Sarah, a ninety-year-old woman, give birth?”
He considered his own body to be already dead( since he was about 100 years old) and also considered the deadness of Sarah’s womb, without weakening in the faith.He did not waver in unbelief at God’s promise but was strengthened in his faith and gave glory to God,