Question
If a disbeliever performed ablution without intention, then converted to Islam, is it permissible for him to pray with this ablution?
Answer
I say, and with God's success: If he performed ablution without intention and then prayed, his prayer is valid with this ablution. Similarly, if he performed ablution with intention and then prayed; because the intention of a disbeliever is void due to lack of eligibility, and intention is not a condition for ablution. Refer to: Sharh Al-Wiqayah p. 108, Al-‘Inayah 1: 115, and Radd Al-Muhtar 1: 165, and God knows best.