Matt.23
[23] Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.
Jesus is telling the Pharisees to do these other things, which include tithe. So Jesus did talk about tithing in the New Testament.