Ambrose of Milan
Catena Aurea · Lukasevangelium 18
And they brought unto him also infants, that he would touch them: but when his disciples saw it, they rebuked them. But Jesus called them unto him, and said, Suffer little children to come unto me, and forbid them not: for of such is the kingdom of God. Verily I say unto you, Whosoever shall not receive the kingdom of God as a little child shall in no wise enter therein.
It may be thought strange by some that the disciples wished to prevent the little children from coming to our Lord, as it is said, when they saw it, they rebuked them. But we must understand in this either a mystery, or the effect of their love to Him. For they did it not from envy or harsh feeling towards the children, but they manifested a holy zeal in their Lord’s service, that he might not be pressed by the crowds. Our own interest must be given up where an injury is threatened to God. But we may understandthe mystery to be, that they desired the Jewish people to be first saved, of whom they were according to the flesh.