related to the adhaan...2
following the declaration of faith called by the mu.adhdhin,
I too bear witness that none has the right to be worshipped
except Allaah, alone, without any partner, and that Muhammad
is His slave and Messenger.
I am pleased with Allaah as a Lord,
and Muhammad as a Messenger and Islaam as a religion"
The instruction to say it immediately after is related by
Ibn Khuzaymah 1/220