Sayyiduna Ali (may Allah be pleased with him) took the hand of Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him), made him stand between two rows, and said to him: "Narrate what (hadith) you heard from the Messenger of Allah (peace and blessings be upon him)!" So he related: I heard him (peace and blessings be upon him) saying: "A brother's daughter and a sister's daughter through suckling (a foster relationship) are not lawful (to marry)." This chain is da'if (weak); its narrator Jabir (bin Yazid) al-Ju'fi is very weak, and Imam Abu Ja'far's hearing from Sayyiduna Ali and Sayyiduna Ka'b (may Allah be pleased with them both) is not established.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب النكاح / 1554
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: هَذَا الْإِسْنَادُ ضَعِيفٌ ، وَجَابِرٌ هُوَ الْجُعْفِيُّ ضَعِيفٌ بِمَرَّةٍ ، وَأَبُو جَعْفَرٍ لَمْ يَسْمَعْ مِنْ عَلِيٍّ ، وَلَا مِنْ كَعْبٍ رَضِيَ اللهُ عَنْهُمَا . » «أخرجه المعجم الكبير للطبراني برقم: 340»