Luke 14:12
Then Jesus said to his host, when you give a luncheon or dinner, do not invite your friends, your brothers or sisters, your relatives, or your rich neighbors; if you do, they may invite you back and so you will be repaid — the instruction to the host is the most socially radical of the dinner teachings. Do not invite friends, relatives, rich neighbors: the standard reciprocal hospitality network. If you do, they may invite you back: the repayment eliminates the grace of the giving.