Luke 16:17

“But it is easier for heaven and earth to pass away, than for one tittle of the law to fall.”

But all this does not mean that the Instruction of God (the Law) has been superseded, for nothing in that Instruction can fail. Heaven and earth will pass away before that can happen. Every last letter or part of letter is sacrosanct. The tittle (or ‘horn') was the addition made to some Hebrew letters in order to differentiate them (compare Matthew 5:18 which has ‘not one iota or tittle'). We should note Jesus' high view of Scripture.

And it is the Kingly Rule of God under which that true Instruction will be fulfilled. But the problem here is that the Pharisees, far from honouring God's Instruction in this way, have woven it into a pattern of their own choosing. The result is that it means that they are failing to recognise its true meaning and its fulfilment in Him. For while it is their claim that they honour that Instruction, and would even die for it, they have in fact transformed it into something unrecognisable, as He will now evidence from one example, their teaching on divorce.