To protect mind from attracting towards sins, prophet (ﷺ) used to say:

اَللَّهُمَّ اِنِّي اَعُوذُ بِكَ مِنْ مُنْكَرَاتِ الْاَخْلَاقِ وَالْأَعْمَالِ وَالْأَهْوَاءِ

Allaahumma inni a`udhu bika min munkaraatil-akhlaaqi wal-a`maali wal-ahwaa

O Allah, I seek refuge in You from evil character, evil actions, and evil desires.

Reference: Sahih. Tirmidhi: 3591