From Authentic sources Forty Rabbana Supplications
1. This du`a was read by Ibrahim and Ismail when they completed the building of the Ka’bah.
2. The lesson is that a person must not be satisfied with actions only. Rather, after the action, be humble and beg Allah to accept it. This is taught from the action of Ibrahim Ismail . After completing such a lofty action he does not express pride, rather he asks Allah to accept the action.