'Firsthand' in the Bible

Israel worshiped the Lord throughout Joshua's lifetime and as long as the elderly men who outlived him remained alive. These men had experienced firsthand everything the Lord had done for Israel.

I must endure the Lord's anger, for I have sinned against him. But then he will defend my cause, and accomplish justice on my behalf. He will lead me out into the light; I will experience firsthand his deliverance.