Azuth's Fedensor

Invoking Azuth, the Lord of Spells, you temporarily open the mind of the creature touched. Before the spell ends, the target can call a single spell of 5th level or less to memory that they do not know or have prepared, but have either cast before or seen and heard cast. The target is then considered to have that spell prepared until their next long rest and can cast it using their own spell slots or as a ritual if it is a ritual spell. During that time, the spell's material components are not required if they are not essential to the spell's function and are 500g or less in value.

Using a Higher-Level Spell Slot. The spell can be of any level the target can cast if you use a spell slot of 6th level or higher.

Adapted from the AD&D 2nd edition book Faiths & Avatars.