'Three' in the Bible

Then Moses separated three cities on this side the Jordan toward the sun-rising,

At the end of three years thou shalt bring forth all the tithe of thine increase the same year, and shalt lay it up within thy gates;

Three times in the year shall all thy males appear before Jehovah thy God in the place which he will choose, at the feast of unleavened bread, and at the feast of weeks, and at the feast of tabernacles; and they shall not appear before Jehovah empty:

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.

thou shalt separate three cities for thyself in the midst of thy land, which Jehovah thy God giveth thee to possess.

Thou shalt prepare thee the way, and divide the territory of thy land, which Jehovah thy God giveth thee to inherit, into three parts, so that every slayer may flee thither.

Therefore I command thee, saying, Thou shalt separate three cities for thyself.

(if thou keep all this commandment to do it, which I command thee this day, to love Jehovah thy God, and to walk in his ways continually), then shalt thou add three cities more for thyself to these three,

One witness shall not rise up against a man for any iniquity, and for any sin, in any sin that he sinneth: at the mouth of two witnesses, or at the mouth of three witnesses, shall a matter be established.