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See note [55] on 8:50 .
It is all very well for them to practise hypocrisy in this life. How will they feel at death, when they find that the angels know all, and touch the very spots they had taken such care to conceal?
Their faces and their backs: there is a subtle metaphor. The face is what looks to the front, the side you present to the outer world; the back is what is not shown, what is hidden from the world. The hypocrites will be hit at both points. Or, the face is what they boast of, what they are proud of; the back is the skeleton in the cupboard, the things they dare not utter, but which yet haunt them. The hypocrites are hit on every side. Cf. viii. 50.