A.T. Robertson Commentary Matthew 12:38

"Then certain of the scribes and Pharisees answered him, saying, Teacher, we would see a sign from thee." — Matthew 12:38 (ASV)

A sign from thee (απο σου σημειον). One wonders at the audacity of scribes and Pharisees who accused Jesus of being in league with Satan and thus casting out demons who can turn round and blandly ask for a "sign from thee." As if the other miracles were not signs! "The demand was impudent, hypocritical, insulting" (Bruce).