Acts 15:8

And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us;

And God, which knoweth the hearts - implying that the state of the heart before God is the real test of one's rightful standing in the visible Church; and though this cannot be certainly known to men, no principle can be sound which goes in the face of it.

Bare them witness, giving them the Holy Spirit, even as he did unto us - (.)