Narrator:Abu Hurayrah
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَنْكِحَ أَو يتْرك»
Abu Huraira reported God’s Messenger as saying, “A man must 'not ask a woman in marriage when his brother has done so already, until he marries or gives her up." (Bukhari and Muslim.)
Reported by Muslim (No. 1408g, 1413a), Abu Dawud (No. 2080), An-Nasa’i (No. 3240, 3241, 3242, 4502), Ibn Majah (No. 1867), Malik (No. 1094), Ahmad (No. 6950, 7144, 7878, 9153, 9520, 9572, 9925, 9953) and Ad-Darimi (No. 2080). Cited in Mishkat al-Masabih (No. 3144).