דניאל, פרק א׳, פסוק י״ט

The training period culminates in a direct encounter with the Babylonian king, serving as the ultimate test of the candidates' abilities. The king conducts a personal examination of the young men to assess their spiritual and intellectual development. This evaluation includes all the youths recruited from across the empire [ביאור שטיינזלץ, מלבי״ם], though it may have focused specifically on the Jewish children brought into exile [אבן עזרא].

To determine their individual levels of intelligence, the king engages them in conversation. The primary approach among commentators is that he spoke with them about matters of wisdom and intellect, possibly conversing in his own native language [אבן עזרא]. Another perspective highlights the king's own shrewdness during this process. Rather than relying on complex riddles, he is able to recognize their superior minds simply through ordinary conversation [אלשיך].

The results of this examination are undeniable. Daniel and his three friends emerge as the most complete, wise, and educated among all the candidates. Their distinct advantage serves as a clear display of divine providence. Despite subsisting entirely on seeds to avoid defilement from the royal diet, God granted them such extraordinary wisdom that their superiority over those who ate the king's food is immediately apparent [אלשיך]. As a result of their unmatched excellence, these four young men are exclusively selected from the entire group of candidates, receiving permanent appointments to remain in the palace and serve directly before the king.