Albert Barnes on Matthew 13:12

Whosoever hath, etc. This is a proverbial mode of speaking. It means that a man who improves what light, grace, and opportunities he has, shall have them increased. From him that improves them not, it is proper that they should be taken away. The Jews had many opportunities of learning the truth, and some light still lingered among them. But they were gross and sensual, and misimproved them, and it was a just judgment that they should be deprived of them. Superior knowledge was given to the disciples of Christ; they improved it, however slowly, and the promise was that it should be greatly increased.

(b) "For whosoever" Mt 25:29, Lk 9:26