It is narrated from Hazrat Abdur Rahman bin Abza (may Allah be pleased with him) on the authority of Ubayy bin Ka'b (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) used to teach us this supplication to recite in the morning: "We have entered the morning upon the natural religion of Islam, upon the word of sincerity, upon the Sunnah of our Prophet Muhammad (peace and blessings be upon him), and upon the religion of our father Ibrahim (peace be upon him), who was upright and was not among the polytheists." And he (peace and blessings be upon him) instructed to recite this supplication in the evening as well.