Abraham was called by God to be faithful and to be an example of faith to succeed generations in the whole of his life by standing firm. But he became unfaithful to God in that Sarah was his wife, and again he married his maid Hager to fulfill Godís promise that he gave them without knowing that God is ever late to his promises but he waits for the right time.
So Abraham as an example decided to assist God for being impatient and that was sin. God of mercy and compassion gave him a second chance whereby he fulfilled his promise in giving them a son. How many times have you gone astray? Do you know that there is a second chance if only you realize your mistake?