Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:1226j – Yaḥyá b. Saʿīd > ʿImrān al-Qaṣīr > Abū Rajāʾ > ʿImrān b. Ḥuṣayn Bimithlih Ghayr

We did that (Tamattu') in the company of Messenger of Allah ﷺ and he did not say anything but he (the Holy Prophet) commanded us to do it.  

مسلم:١٢٢٦j – وَحَدَّثَنِيهِ مُحَمَّدُ بْنُ حَاتِمٍ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ عَنْ عِمْرَانَ الْقَصِيرِ حَدَّثَنَا أَبُو رَجَاءٍ عَنْ عِمْرَانَ بْنِ حُصَيْنٍ بِمِثْلِهِ غَيْرَ

أَنَّهُ قَالَ وَفَعَلْنَاهَا مَعَ رَسُولِ اللَّهِ ﷺ وَلَمْ يَقُلْ وَأَمَرَنَا بِهَا