‘Promised’ is perhaps a little misleading; ‘undertook to give him money’ would be better, because the words used, both in Matthew's Gospel and in Mark’s Gospel could imply that they weighed it out to him there are and then. That is very likely.
Again, hypocrisy is so dangerous. You come to pray in the service and speak to others as a Christian man or woman and hopefully you are, and yet you go home during the week – Monday, Tuesday, Wednesday – and you don’t pray, don’t have your devotions, don’t have any communion with the Lord. You have just uttered, perhaps, a few superficial sentences of prayer. You are playing the hypocrite; you are pretending to live a life you are not living. Don’t imagine you can snap out of that easily at the end of the week and straighten yourself out. The more we act the hypocrite, the easier it is to do, and it deepens and extends to all sorts of other things. In Judas you see the power of pretence, the power of hypocrisy, a lack of sincerity and genuineness. We see a man who started with Christ, possibly just mistaken and deluded with regard to who he was and what his mission was. But the three years of pretence turn him into an utter traitor, a man of hardness and pride and great treachery. So we must all fear hypocrisy. If you find yourself playing the hypocrite and the pretender, it is the most urgent thing to snap out of it and to cry out in repentance and to pray for a genuine heart.