After completing wudu

أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ، وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ

Ash-hadu an la ilaha illallahu wahdahu la sharika lah, wa ash-hadu anna Muhammadan 'abduhu wa rasuluh

“I bear witness that none has the right to be worshipped but Allah alone, without partner, and I bear witness that Muhammad is His servant and Messenger. (The eight gates of Paradise are opened for the one who says it.)”

— Sahih Muslim 234