Aufer a nobis, quaesumus, Domine.
Latin text
Aufer a nobis, quaesumus, Domine, iniquitates nostras: ut ad Sancta sanctorum puris mereamur mentibus introire. Per Christum Dominum nostrum. Amen.
Context
As the priest ascends, this prayer asks that sins be taken away before entering the holy place.
Source: Missale Romanum 1962, Ordo Missae, as published by Divinum Officium.
Divinum Officium