'Reliable' in the Bible

But I will raise up for myself a reliable priest; he will do just according to what [is] in my heart and in my soul. I will build for him a lasting house and he will walk continually before my anointed one {forever}.

Investigate and find out all the hiding places there where he hides, and return to me with reliable information. Then I'll go down with you, and if he's in the land, I'll search him out among all the thousands of Judah."

So Achish summoned David and told him, “As the Lord lives, you are an honorable man. I think it is good to have you working with me in the camp, because I have found no fault in you from the day you came to me until today. But the leaders don’t think you are reliable.

Achish answered David, “I’m convinced that you are as reliable as the Angel of God. But the Philistine commanders have said, ‘He must not go into battle with us.’