The Prophet ﷺ addressed them, saying, "To proceed..."
حدثنا أبو بكر بن أبي شيبة حدثنا محمد بن فضيل عن أبي حيان عن يزيد بن حيان
أن النبي ﷺ خطبهم فقال أما بعد
No references are available.
Muslim narrated it in "The Book of the Virtues of the Companions," chapter "The Virtues of Ali bin Abu Talib" , hadith no. 2408, from Ibn Abu Shayba, in a longer form, and it is also found in Musannaf 8/466.