مسند أحمد

It was narrated that Ma'dan bin Abi Talhah said: 'Umar said: I never asked the Messenger of Allah (ﷺ) ﷺ about anything more than I asked him about kalalah, until he poked me in the chest with his finger and said: `Is not ayatus-saif (the verse of summer, i.e., it was revealed in summer), which appears at the end of Sooratan-Nisa', sufficient for you?”