For one afflicted with doubt in his faith

(Say:) I seek refuge in Allah. (Then you should desist from doing what you are in doubt about.)

Reference:Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 6/336, Muslim 1/120.Hisnul Muslim 133

أَعـوذُ بِاللهِ

Transliteration

A`ūdhu billāh

Translation

(Say:) I seek refuge in Allah. (Then you should desist from doing what you are in doubt about.)