'Service' in the Bible

At that time Jehovah separated the tribe of Levi, to bear the ark of the covenant of Jehovah, to stand before Jehovah to do service unto him, and to bless in his name, unto this day.

“It shall not seem hard to you when you set him free, for he has given you six years with double the service of a hired man; so the Lord your God will bless you in whatever you do.

and the priests the sons of Levi shall come near; for them Jehovah thy God hath chosen to do service unto him, and to bless in the name of Jehovah; and according to their word shall be every controversy and every stroke.

and the Egyptians do us evil, and afflict us, and put on us hard service;