Sunni References:
• Sahih al-Tirmidhi, v2, p86, v9, pp 74-75
• Sunan Abu Dawud, v2, p7
• Musnad Ahmad Ibn Hanbal, v1, pp 84,376; V3, p63
• al-Mustadrak ala al-Sahihayn, by al-Hakim, v4, p557
• Jami’ al-Saghir, by al-Suyuti, pp 2,160
• al-Urful Wardi, by al-Suyuti, p2
• al-Majma’, by al-Tabarani, p217
• Tahdhib al-Tahdhib, by Ibn Hajar al-Asqalani, v9, p144
• Fat’h al-Bari fi Sharh Sahih al-Bukhari, by Ibn Hajar Asqalani, v7, p305
• al-Sawa’iq al-Muhriqah, by Ibn Hajar al-Haythami, Ch. 11, section 1, p249