Albert Barnes Commentary Zechariah 14:19

"This shall be the punishment of Egypt, and the punishment of all the nations that go not up to keep the feast of tabernacles." — Zechariah 14:19 (ASV)

This shall be the sin of Egypt and the sin of all nations that come not up to keep the feast of tabernacles - For before the coming of the Saviour, the pagan's excuse had perhaps, in part, been a good one: that they had been called by no one. For no one had preached to them. Therefore the Saviour also, pointing this out in the Gospel parables, said that the laborers, called at the eleventh hour, said, No man hath hired us (Matthew 20:7).

But when Christ cast His light upon us, bound the strong man (Matthew 12:29), removed from his perverseness those subject to him, justified by faith those who came to Him, and laid down His life for the life of all, those who do not admit so revered a grace will find no sufficient excuse.

It will be true of the pagan too, as Christ said of them, If I had not come and spoken unto them, they had not had sin: but now they have no cloke for their sin (John 15:22).

The prophet says “sin,” not punishment, for sin includes “the punishment,” which is its due, and which it entails: it does not express the punishment, apart from the sin. It was “the sin” which comprised and involved all other sin, the refusal to worship God as He had revealed Himself, and to turn to Him. It was to say, We will not have Him to reign over us (Luke 19:14).