"Anas bin Malik was asked about the takbir in the prayer. He said: "The takbir should be said when bowing, when prostrating, when raising one's head from prostration and when standing up following the first two rak'ahs.' Hutaim said: 'From whom did you learn this?' He said: 'From the Prophet ﷺ, Abu Bakr and 'Umar, may Allah (SWT) be pleased with them.' Then he fell silent and Hutaim said to him: 'And 'Uthman?' He said: 'And 'Uthman.'" (Using translation from Nasāʾī 1179)  

«يُكَبِّرُ إِذَا رَكَعَ وَإِذَا سَجَدَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ السُّجُودِ وَإِذَا قَامَ مِنَ الرَّكْعَتَيْنِ» فَقَالَ حُطَيْمٌ عَمَّنْ تَحْفَظُ هَذَا؟ قَالَ عَنِ النَّبِيِّ ﷺ وَأَبِي بَكْرِ وَعُمَرَ ثُمَّ سَكَتَ فَقَالَ لَهُ حَطِيمٌ وَعُثْمَانَ قَالَ وَعُثْمَانَ  

"Ali bin Abi Talib prayed, and he said the takbir every time he went down and came up, in all movements of the prayer. 'Imran bin Husain said: 'This reminds me of the prayer of the Messenger of Allah ﷺ.'" (Using translation from Nasāʾī 1180)   

عِمْرَانُ لَقَدْ ذَكَّرَنِي هَذَا صَلَاةَ رَسُولِ اللهِ ﷺ