'Can Testify' in the Bible

You yourselves can testify that I said, 'I am not the Christ,' but rather, 'I have been sent before him.'

as both the high priest and the whole council of elders can testify about me. From them I also received letters to the brothers in Damascus, and I was on my way to make arrests there and bring the prisoners to Jerusalem to be punished.

For I can testify that they are zealous for God, but their zeal is not in line with the truth.

For I can testify that he has worked hard for you and for those in Laodicea and Hierapolis.