Verses with the word proper in the New Testament (3 verses):

Acts 1:19
And it was known unto all the dwellers at Jerusalem; insomuch as that field is called in their proper tongue, Aceldama, that is to say, The field of blood.

1 Corinthians 7:7
For I would that all men were even as I myself. But every man hath his proper gift of God, one after this manner, and another after that.

Hebrews 11:23
By faith Moses, when he was born, was hid three months of his parents, because they saw he was a proper child; and they were not afraid of the king's commandment.