Musnad Ahmad 378
It was narrated that ‘Umar bin al-Khattab said:
Before the prohibition of khamr was revealed, ‘Umar said: O Allah, give us a clear ruling on khamr. Then the verse which is in Soorat al Baqarah was revealed: `They ask you (O Muhammad (ﷺ) concerning alcoholic drink and gambling. Say: “In them is a great sin...” [al-Baqarah 2:219]. `Umar was summoned and it was recited to him. He said: O Allah, give us a clear ruling on khamr, and the verse which is in Soorat an-Nisa` was revealed: “O you who believe Approach not As-Salah (the prayer) when you are in a drunken state.` [an-Nisa 4:43). When the Iqamah for prayer was given, the caller of the Messenger of Allah (ﷺ)  would call out: Do not approach the prayer drunk, ‘Umar was summoned and it was recited to him. He said: O Allah, give us a clear ruling on khamr, and this verse was revealed then Umar was summoned and recited to hirn when he reached `So, will you not then abstain?` |al-Ma`idah 5:91]. Then `Umar said: We abstain, we abstain.
حَدَّثَنَا خَلَفُ بْنُ الْوَلِيدِ، حَدَّثَنَا إِسْرَائِيلُ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي مَيْسَرَةَ، عَنْ عُمَرَ بْنِ الْخَطَّابِ، رَضِيَ اللَّهُ عَنْهُ قَالَ لَمَّا نَزَلَ تَحْرِيمُ الْخَمْرِ قَالَ اللَّهُمَّ بَيِّنْ لَنَا فِي الْخَمْرِ بَيَانًا شَافِيًا فَنَزَلَتْ هَذِهِ الْآيَةُ الَّتِي فِي سُورَةِ الْبَقَرَةِ ‏{‏يَسْأَلُونَكَ عَنْ الْخَمْرِ وَالْمَيْسِرِ قُلْ فِيهِمَا إِثْمٌ كَبِيرٌ‏}‏ قَالَ فَدُعِيَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ فَقُرِئَتْ عَلَيْهِ فَقَالَ اللَّهُمَّ بَيِّنْ لَنَا فِي الْخَمْرِ بَيَانًا شَافِيًا فَنَزَلَتْ الْآيَةُ الَّتِي فِي سُورَةِ النِّسَاءِ ‏{‏يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَقْرَبُوا الصَّلَاةَ وَأَنْتُمْ سُكَارَى‏}‏ فَكَانَ مُنَادِي رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا أَقَامَ الصَّلَاةَ نَادَى أَنْ لَا يَقْرَبَنَّ الصَّلَاةَ سَكْرَانُ فَدُعِيَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ فَقُرِئَتْ عَلَيْهِ فَقَالَ اللَّهُمَّ بَيِّنْ لَنَا فِي الْخَمْرِ بَيَانًا شَافِيًا فَنَزَلَتْ الْآيَةُ الَّتِي فِي الْمَائِدَةِ فَدُعِيَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ فَقُرِئَتْ عَلَيْهِ فَلَمَّا بَلَغَ ‏{‏فَهَلْ أَنْتُمْ مُنْتَهُونَ‏}‏ قَالَ فَقَالَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ انْتَهَيْنَا انْتَهَيْنَا‏.‏