Jamieson, Fausset and Brown on Matthew 13:46

46. Who, when he had found one pearl of great price, went and sold all that he had, and bought it--The one pearl of great price, instead of being found by accident, as in the former case, is found by one whose business it is to seek for such, and who finds it just in the way of searching for such treasures. But in both cases the surpassing value of the treasure is alike recognized, and in both all is parted with for it.

The Good and Bad Fish (Mt 13:47-50).

The object of this brief parable is the same as that of the Tares and Wheat. But as its details are fewer, so its teaching is less rich and varied.