Musar su Genesi 49:11

He then proceeded to reveal to them additional insights of great depth, whereupon Rabbi Yehudah and Rabbi Yitzchak came and kissed him on the head and said, “Blessed is the Merciful One who allowed us to hear these things. And blessed is the Merciful One for not allowing these things to be wasted on that old man.” Then they arose and began walking. They spied a grapevine growing in a certain garden and the child began, “He will bind his donkey-foal to the vine and the son of the donkey-mare to the vine-branch” (Bereishis 49:11) — “The idea is this: The ‘foal’ and the ‘mare’ are two potent shells of impurity. In order to weaken their power so that they will not confuse the world the Holy One Blessed is He formed the world with the name Ya-h, as it is written, ‘For with Ya-h Hashem formed the worlds’ (Yeshayahu 26:4). “This is what is hinted at here, that the Holy One Blessed is He took the name Ya-h (י-ה) and included it within the word for ‘his foal.’ For the verse should have said simply ‘foal’ (עיר), but it said ‘his foal’ (עירה) instead, to include the letter heh of the name Y-h within it. “Similarly, the word ‘branch’ should have been written soreik (שׂורק) but instead it is written with an extra heh at the end, soreikah (שׂורקה), while the word ‘son’ is written with an extra yud — b’ni (בני) instead of ben (בן).” The child then went on to reveal to them other esoteric insights.