Deuteronomy 17:6

On the testimony of two or three witnesses a man shall be put to death, but he shall not be executed on the testimony of a lone witness.

Berean Standard Bible
Other translations

King James Version

At the mouth of two witnesses, or three witnesses, shall he that is worthy of death be put to death; but at the mouth of one witness he shall not be put to death.

World English Bible

At the mouth of two witnesses, or three witnesses, he who is to die shall be put to death. At the mouth of one witness he shall not be put to death.

American Standard Version

At the mouth of two witnesses, or three witnesses, shall he that is to die be put to death; at the mouth of one witness he shall not be put to death.

Geneva Bible 1599

At the mouth of two or three witnesses shall he that is woorthie of death, die: but at the mouth of one witnesse, he shall not die.

Darby Translation

At the mouth of two witnesses, or three witnesses, shall he that is to die be put to death: he shall not be put to death at the mouth of one witness.

Young's Literal Translation

By the mouth of two witnesses or of three witnesses is he who is dead put to death; he is not put to death by the mouth of one witness;

Bible in Basic English

On the word of two or three witnesses, a man may be given the punishment of death; but he is not to be put to death on the word of one witness.

In context

5you must bring out to your gates the man or woman who has done this evil thing, and you must stone that person to death.

7The hands of the witnesses shall be the first in putting him to death, and after that, the hands of all the people. So you must purge the evil from among you.

Read Deuteronomy 17