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Ibn Ezra on Deuteronomy 34:9/אבן עזרא על דברים ל״ד:ט׳

אמלא רוח חכמה. היא דוח ה' והעד כי סמך משה את ידיו עליו כי לא ימצא כמותו בישראל שישען עליו:
1WAS FULL OF THE SPIRIT OF WISDOM. The reference is to the spirit of the Lord.33 (Is. 11:2). It then goes on to explain that the spirit of the Lord is the spirit of wisdom and understanding (Ibid.). See I.E. on Ex. 31:3 (Vol. 2, pp. 645,646). For Moses had laid his hands upon him is proof of this,34. for there was not found in Israel one such as Joshua for Moses to lean on.35 to mean relied on him, i.e., took him for a disciple. Be that as it may, according to I.E, For Moses had laid his hands upon him does not mean that the placing of Moses’ hand on Joshua caused Joshua to be full of the spirit of wisdom but rather that Moses placed his hands on Joshua because Joshua was full of the spirit of God.
בויעשו כאשר צוה ה' את משה. שישמעו אל יהושע:
2AND DID AS THE LORD COMMANDED MOSES. That they hearken unto Joshua.