Vessels of Mercy
God’s covenant with Abraham was very serious business to God and God required a pretty heavy price from Abraham and his descendants to enter into this covenant, but the reward was to be continual blessing and the promise of Canaan Land for all his future generations—as long as they were willing to pay the price of circumcision. This was to mark them as belonging to God. When Moses erred and failed to have his and Zipporah’s son circumcised, God had to honor his word and exact punishment for breaking the covenant. But, at the last minute, Zipporah circumcised their son and Moses lived on to be mightily used of God.
God chose to forgive Moses and continue honoring him under the Abrahamic covenant, also.
In Exodus 33:19, God said, "Moses, I know you by name and I will show mercy on whom I will show mercy!" No man can merit God’s mercy. No man can cause his own worthiness in God’s sight. It’s the mercy and compassion of a loving God towards fallible man that meets us where we are.