The passuk opens by saying that Hashem called to Moshe – ויקרא אל משה (Vayikra 1:1). The Ba’al Haturim discusses why the last letter alef in the word ויקרא is written small. In a sefer Torah most letters are written uniformly, the same size. The alef in ויקרא is written smaller than the other letters. The Ba’al Haturim says that the reason for that is because Moshe Rabeinu was exceedingly humble. He was the ענו מכל אדם, the most humble of people. In spite of his immense brachos, in spite of all the greatness that Hashem bestowed upon him, Moshe was the humblest of all people.