'Hireling' in the Bible

'It is not hard in thine eyes, in thy sending him away free from thee; for the double of the hire of an hireling he hath served thee six years, and Jehovah thy God hath blessed thee in all that thou dost.

'Thou dost not oppress a hireling, poor and needy, of thy brethren or of thy sojourner who is in thy land within thy gates;