(Imām Bukhārī narrates): Ishāq al-Wāsitī narrated to us, he said: Khālid narrated to us, from al-Jurairī, from Abī al-'Alā', from Mutarrif, from 'Imrān ibn Husain, may Allāh be pleased with him, he narrates that:
he prayed with 'Alī, may Allāh be pleased with him, then he said that this person reminded us of that prayer which we used to pray with the Messenger of Allāh ﷺ, so he mentioned that whenever he rose or bent down, he recited "Allāhu Akbar."
حَدَّثَنَا إِسْحَاقُ الْوَاسِطِيُّ، قَالَ حَدَّثَنَا خَالِدٌ، عَنِ الْجُرَيْرِيِّ، عَنْ أَبِي الْعَلاَءِ، عَنْ مُطَرِّفٍ، عَنْ عِمْرَانَ بْنِ حُصَيْنٍ، قَالَ صَلَّى مَعَ عَلِيٍّ ـ رضى الله عنه ـ بِالْبَصْرَةِ فَقَالَ ذَكَّرَنَا هَذَا الرَّجُلُ صَلاَةً كُنَّا نُصَلِّيهَا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم. فَذَكَرَ أَنَّهُ كَانَ يُكَبِّرُ كُلَّمَا رَفَعَ وَكُلَّمَا وَضَعَ.
Reference: Sahih Al Bukhari 784