Dua immediately after wudu
Umar ibn Al-Khattab reported that the Prophet (sallAllahu alayhi wasalam) said:
‘There is not one of you that makes wudu, and does it perfectly, then says: I testify that there is no diety worthy of worship except Allah. he is Alone, having no partners. And I bear witness that Muhammad is His slave and messenger’, except that the eight gates of Paradise are opened for him, and he can enter into it through whichever one he pleases’
[Muslim #234, abu Dawud #162, Ahmad, an-Nasa'i]
‘There is not one of you that makes wudu, and does it perfectly, then says: I testify that there is no diety worthy of worship except Allah. he is Alone, having no partners. And I bear witness that Muhammad is His slave and messenger’, except that the eight gates of Paradise are opened for him, and he can enter into it through whichever one he pleases’
[Muslim #234, abu Dawud #162, Ahmad, an-Nasa'i]