Translation:

91. And (remember) her who guarded her chastity: We breathed into her of Our Spirit and We made her and her son a Sign for all peoples.

Notes (Tafseer)

2748. Mary the mother of Jesus. Chastity was her special virtue: with a son of virgin birth, she and Jesus became a miracle to all nations. That was the virtue with which they (both Mary and Jesus) resisted evil.