Matthew 27:7

‘And they took counsel, and bought with them the potter's field, to bury strangers in.'

So they then discussed the matter together, and finally came up with the idea of buying ‘the potter's field' which had come up for sale, and could be used for burying non-Jews in. The field may simply have been popularly named this, having at some stage been used by potters, or it may in fact have belonged to a well known potter. Alternatively it may have been the site of a one-time clay quarry in the Valley of Hinnom, now exhausted, from which the potters' clay had once come, but only now useful as a burial ground for the not too particular.

In Acts we learn that Judas ‘bought the field'. But there is no genuine discrepancy. The Chief Priests would have agreed that it was bought courtesy of Judas. It was his money that bought the field.