يَقُولُ: «وَ أَنَا أَشْهَدُ أَنْ لَا إله إلَّا اللهُ وَ حْدَهُ لَا شَرِيْكَ لَهُ، وَ أَنَّ مُحَمَّداً عَبْدُهُ وَ رَسُولُهُ، رَضِيْتُ بِاللهِ رَبًّا، وَ بِمُحَمَّدٍ رَسُولًا، وَ بِالإِسْلامِ دِيْنًا»[1] «يَقُولَ ذَلِكَ عَقِبَ تَشَهُّدِ المُؤَذِّنِ».[2]

Say: “And I too bear witness that none has the right to be worshipped except Allāh, alone, without partner, and that Muḥammad is His slave and Messenger. I am pleased with Allāh as a Lord, and Muḥammad as a Messenger and Islam as a religion.”[1] Say this after the declaration of faith called by the muadhdhin.[2]

Reference: [1] Muslim (#386, 1/290). [2] Ibn Khuzaymah (#422, 1/220).