Albert Barnes on Acts 1:18

Now this man, etc. The money which was given for betraying the Lord Jesus was thrown down in the temple, and the field was purchased with it by the Jewish priests. See Mt 27:5,10, Mt 27:5, Mt 27:5. A man is said often to do a thing, when he furnished means for doing it.

The reward of iniquity. The price which he had for that deed of stupendous wickedness--the betraying of the Lord Jesus.

And falling headlong. He first hanged himself, and then fell and was burst asunder, Mt 27:5.

(a) "this man" Mt 27:5-10 (b) "reward of iniquity" 2Pet 2:15 (*) "purchased a field" or, "Caused a field to be purchased"