God, Deuteronomy 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 Judas, 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 showed 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 employed in the service of the temple, for, Isaiah 52:11, those that bear the vessels of the Lord ought to be holy. Thus, to justify our Saviour's words, they strain at a gnat, and swallow a camel.
Related Commentaries of Matthew 27:6
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.