Matthew Poole and continuators on Matthew 27:6

6 And the chief priests took the silver pieces and said, It is not lawful for to put them into the treasury, because it is the price of blood.

God, Deut. 23.18. had forbidden to bring the Price of a Whore, or a Dog, into the Temple, This, they had interpreted of all filthy Gain: Upon which they thus determine, that it was not Lawful for them, to put the Money they had given Iudas, for so sordid a Service as that, of betraying his Master, into the Chest, or place which they had, where they kept the Monies given for the Repairs of the Temple; and in this they were right enough, perhaps, but in this they shewed themselves stupidly blind Hypocrites, that they saw not it was much less Lawful for them, who had hired him to this sordid Action, to be imployed in the Service of the Temple, for Isa. 52.11. those that bear the Vessels of the Lord, ought to be Holy. Thus to justifie our Saviours words, they strain at a Gnat, and swallow a Camel.