Jesus gave these instructions to His disciples:
Luke 10:7 "And in the same house remain, eating and drinking such things as they give: for the labourer is worthy of his hire. Go not from house to house."
Jesus ministry was supported by the offerings received from His followers:
Luke 8:1-3 "And it came to pass afterward, that he went throughout every city and village, preaching and shewing the glad tidings of the kingdom of God: and the twelve were with him, 2 And certain women, which had been healed of evil spirits and infirmities, Mary called Magdalene, out of whom went seven devils, 3 And Joanna the wife of Chuza Herod's steward, and Susanna, and many others, which ministered unto him of their substance.
(NLT) ". . . and many others who were contributing their own resources to support Jesus and his disciples."
I've never met a preacher who didn't work for free when the situation required it.