Some may think these verses seem archaic, but this passage is really just about work ethic.
We as believers in Jesus are to work as He did; to serve others and give the best of ourselves and let God provide for our needs.
When we work to serve others geniuenly and not out of obligation or what we can get from it, God blesses us.
It’s when we try to work for our needs, our wants, and only for what we can get out of it; that we receive only what we worked for. But when we do our best work for others; God blesses us.