'Legally' in the Bible

A single witness may not testify against another person for any trespass or sin that he commits. A matter may be legally established only on the testimony of two or three witnesses.

So I am legally informing you: Acquire it before those sitting here and before the leaders of my people! If you want to exercise your right to redeem it, then do so. But if not, then tell me so I will know. For you possess the first option to redeem it; I am next in line after you." He replied, "I will redeem it."

(Now this used to be the customary way to finalize a transaction involving redemption in Israel: A man would remove his sandal and give it to the other party. This was a legally binding act in Israel.)

The city is sure to fall into the hands of the Babylonians. Yet, in spite of this, you, Lord God, have said to me, "Buy that field with silver and have the transaction legally witnessed."'"

Pilate told them, "Take him yourselves and pass judgment on him according to your own law!" The Jewish leaders replied, "We cannot legally put anyone to death."