'Searching' in the Bible

And they returned from searching of the land after forty days.

Canst thou by searching find out God? canst thou find out the Almighty unto perfection?

The spirit of man is the candle of the LORD, searching all the inward parts of the belly.

Hast thou not known? hast thou not heard, that the everlasting God, the LORD, the Creator of the ends of the earth, fainteth not, neither is weary? there is no searching of his understanding.

Searching what, or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow.