(1) The verb is with the letter jim, i.e. yujibkum, meaning “He will answer your supplication.” This is a strong exhortation to pronounce the amin, so special care should be given to it, as al-Nawawi remarked. (2) The report comes from Abu Musa al-Ashari  who said: “The Messenger of Allah ﷺ addressed us, clarified for us our sunnah, and taught us our prayer. He said: ‘When you pray, straighten your rows; then let one of you lead. When he pronounces the takbir, pronounce the takbir. When he recites: ghayri l-maghdubi alayhim wa la d-dallin (not of those who have incurred wrath, nor of those who are astray), say: amin; Allah will answer you. When he pronounces the takbir and bows, pronounce the takbir and bow, for the imam bows before you and rises before you.’ The Messenger of Allah ﷺ then said: ‘That deed offsets that deed. When he says: samiʿa llahu liman hamidah (Allah hears the one who praises Him), say: allahumma rabbana laka l-hamd (O Allah, our Lord, to You belongs the praise); Allah will hear you, for Allah—Majestic is He—said on the tongue of His Prophet ﷺ: samiʿa llahu liman hamidah. When he pronounces the takbir and prostrates, pronounce the takbir and prostrate, for the imam prostrates before you and rises before you.’ The Messenger of Allah ﷺ added: ‘That deed offsets that deed. And when you sit for the tashahhud, let the first words any of you utters be: al-tahiyyatu llahi wa-l-salawat al-tayyibat, al-salam ʿalayka ayyuhā l-nabi wa rahmatu llahi wa barakatuh, al-salam ʿalayna wa ʿala ʿibadi llahi l-salihin, ash-hadu an la ilaha illa Allah, wa ash-hadu anna Muhammadan ʿabduhu wa rasuluh.’” Recorded by Muslim 2/14-15; Abu Awana 2/128; Abu Dawud 1/153-154; al-Nasaʾi 1/162, 175, 188; al-Darimi 1/315; al-Bayhaqi 2/140-141; al-Ruyani, Musnad 24/119/1; and Ahmad 4/409, all through the route of Qatadah → Yunus b. Jubayr → Hittan b. ʿAbd Allah al-Raqashi. Ibn Majah 1/292, al-Tahawi 1/156, and al-Daraqutni 134—as well as another narration of al-Nasaʾi 1/132—transmit only the portion concerning the tashahhud.