Which preposition to use with stirrers

up Occurrences 3%

The other brass, of 1609, has a portrait of Ann Sewell in Jacobean costume, kneeling, with an epitaph in which she is described as "a worthy stirrer up of others to all holy virtues.

of Occurrences 2%

He sees God's wonders in the deep, but so as rather they appear his playfellows than stirrers of his zeal.

Which preposition to use with  stirrers