Dua After Wudu (Ablution)
أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ
Ashhadu an la ilaha illallahu wahdahu la sharika lahu wa ashhadu anna Muhammadan 'abduhu wa rasuluhu.
"I bear witness that none has the right to be worshipped except Allah, alone without partner, and I bear witness that Muhammad is His slave and Messenger."
Sahih Muslim 234
Spiritual Benefits
This is one of the most spiritually rewarding supplications. The Prophet (PBUH) promised that whoever performs Wudu perfectly and then recites this dua, all eight gates of Paradise will be opened for them to enter through whichever they please.
When Should I Say This Dua?
Say this immediately after completing the physical acts of Wudu, while still in a state of purity.
Proper Etiquette (Sunnah)
Look towards the sky (or simply look upwards) while reciting this declaration of faith.