'Service' in the Bible

About forty thousand armed for military service passed over before Jehovah to the war, unto the plains of Jericho.

but to be a witness between us and you, and between our generations after us, that we might do service to Jehovah before him with our burnt-offerings, and with our sacrifices, and with our peace-offerings; that your children may not say to our children in future, Ye have no portion in Jehovah.