صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
باب إعادة الصلاة - ذكر الخبر المدحض قول من زعم أن معاذا كان يصلي بالقوم فرضه لا نفله
Section on repeating the prayer – mentioning a report refuting the claim that Mu’adh led his people in his obligatory prayer, not a voluntary one
1 hadith
Hadith 2403
Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) narrates: Sayyiduna Mu'adh (may Allah be pleased with him) used to perform the 'Isha prayer behind the Prophet (peace and blessings of Allah be upon him), then he would return to his people and lead them in this prayer.