Acts 4:20

For we cannot but speak the things which we have seen and heard.

For we cannot but speak,.... It was not physically, but morally impossible; or it was not lawful, and therefore they would not speak any other, and they could not avoid speaking, say they,

the things which we have seen and heard; as the miracles and doctrines of Christ, his resurrection from the dead, of which they were eye and ear witnesses. This shows their great fidelity and integrity, their inviolable attachment to Christ, and their fearlessness of the displeasure and wrath of men.