This Bible contradiction is from the Skeptic's Annotated Bible.
The chief priests bought the potter's field.
Matthew 27:6 View context
But the chief priests took the silver pieces and said, “It is not lawful to put them into the treasury, because they are the price of blood.” And they consulted together and bought with them the potter’s field, to bury strangers in. Therefore that field has been called the Field of Blood to this day.
Judas bought the potter's field.
Acts 1:18 View context
Now this man purchased a field with the [a]wages of iniquity; and falling headlong, he burst open in the middle and all his entrails gushed out. And it became known to all those dwelling in Jerusalem; so that field is called in their own language, Akel Dama, that is, Field of Blood.