For her litany for the Agnes Dei in her Mass For Youth, Gen Bryant uses the melodic theme from her Sanctus with a slower tempo in keeping with the liturgical moment. She also blends in lines from the Kyrie, which I thought unusual, but a little research has let me know that many litanies over the years have incorporated lines from the Kyrie so she is farming our traditions creatively.
Lamb of God, you take away the sins of the world, have mercy on us.
(Kyrie Eleison)
Lamb of God, you take away the sins of the world, have mercy on us.
(Christe eleison)
Lamb of God, you take away the sins of the world, grant us peace.