Source, in full
A misreporting of an actual quote praising the trustworthiness of a colleague: "His verbal contract is worth more than the paper it's written on". The identity of the colleague is variously reported as Joseph M. Schenk in Paul F. Boller, John George, They Never Said It (1990), p. 42, or as Joseph L. Mankiewicz in Carol Easton, The Search for Sam Goldwyn (1976). Goldwyn himself was reportedly aware of - and pleased by - the misattribution.