Acts 15:9

and made no distinction between us and them, purifying their hearts by faith.

Surrounding context

15:8 So God, who knows the heart, acknowledged them by giving them the Holy Spirit, just as He did to us,

15:9 and made no distinction between us and them, purifying their hearts by faith.

15:10 Now therefore, why do you test God by putting a yoke on the neck of the disciples which neither our fathers nor we were able to bear?

Translation and sources