‘Ablution is half of faith.’The Prophet (SAWA) [Bihar al-Anwar, v. 80, p. 238, no. 12

‘He who renews his ablution without [the need
to do so to purify] an impurity, Allah renews his repentance without him
[needing to] asking for forgiveness.’ Imam al-Sadiq (AS) [Wasael al-Shi`aah , v. 1, p. 264, no.7

‘He who performs ablution whilst already in a
state of purity is given ten good merits.’ The Prophet (SAWA) [Kanz al-`Ummal, no. 26042

‘He who performs the ablution in the freezing cold weather is given twice the reward, and he who performs the ablution
in the extreme heat is given a single share of the reward.’ Kanz al-`Ummal, no. 26059

‘When the Muslim man performs the ablution,
mistakes committed by his hearing, his sight, his hands and his feet leave him so that when he sits, he sits forgiven.’

‘When the servant performs the ablution, his sins shed away from him just as leaves shed from a tree.’