noun /ˈhaɪrˌlɪŋ/
When my poor James was in the smallpox, did I allow any hireling to nurse him?
b) someone who does a job purely for money, rather than out of interest in the work itself
... it may be truly affirmed that no kind of men love business for itself but those that are learned; for other persons love it for profit, as a hireling that loves the work for the wages;
Wikipedia foundation.