Innocent IV, Pope. [Letter to Clare of Assisi, 1254] in Bullarium Franciscanum Romanorum Pontificum 1.701-02

[Letter from Pope Innocent IV to Clare of Assisi]
The pope grants the sisters the power to accept certain kinds of gifts, as from those who would make up for practicing usury or breaking vows, by charitable gifts to them. The text is the letter to "beloved sons Guardiano and the brothers minor of the order of St. Francis of Assisi," ep.515. The edition notes that a letter "in the same mode" was written to Clare and the nuns on the same day, making the same concessions to them, but since it is dated six months after Clare's death, it must be to her successor.
Online at Epistolae (See also Bibliographia record).