You touch a corpse or other remains. The target is protected and free from decay and cannot be transformed into an undead creature for the duration of the spell.
Gentle Repose 5e
Level: 2nd
Classes: Wizard, Cleric
Casting Time: 1 Action
Range: Touch
Components: V, S, M
Duration: 10 days
This spell also effectively extends the time limit for resurrecting a target, as time spent under the spell’s influence does not count against the time limit of spells such as raise dead.