Du'a for a mother's protection

اللَّهُمَّ إِنِّي أَسْتَوْدِعُكَ أَثْمَنَ مَا عِنْدِي وَأَقْرَبَهَا إِلَى قَلْبِي، اللَّهُمَّ احْفَظْ لِي أُمِّي وَأَنْتَ خَيْرُ الْحَافِظِينَ

Allahumma inni astawdi'uka athmana ma 'indi wa aqrabaha ila qalbi, Allahummah-fadh li ummi wa anta khayrul-hafizhin

O Allah, I entrust to You the most precious thing I have and the closest to my heart. O Allah, protect my mother for me, for You are the best of protectors.

A general supplication, not a narration from the Prophet (peace be upon him).