Rashbam on Leviticus
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ויקרא אל משה - לפי שכתב למעלה בסוף הספר ולא יכול משה לבא אל אהל מועד וגו' - לכך קראוהו הקב"ה מתוך אהל מועד, וכן פירוש המקרא: ויקרא אל משה מאהל מועד וידבר אליו לאמר. מאהל - מוסב על ויקרא - כמו: ויקרא אליו ה' מן ההר לאמר. וישמע את הקול מדבר מאהל - מעל האהל שמע את הקול. ויקרא אליו אלהים מתוך הסנה לאמר. כפל לשון של וידבר, כמו שפירשתי בפרשת נח, כאשר יאמר: דבר אל אהרן ואמרת. כן יאמר: וידבר למשה לאמר למשה.

ויקרא אל משה, in view of our being told at the end of the last portion that Moses could not enter the Tabernacle (Exodus 40,35), this is why now G’d called to Moses from the Tabernacle. As a result, the meaning of the verse here is “G’d called to Moses from the Tent and spoke to him.” The meaning of the verse is parallel to Exodus 19,3 ויקרא אליו ה' מן ההר, where the operative clause is the word מן ההר, “from the mountain.” It is important for us to know from where G’d’s voice originated. At that time it came out of the mountain, whereas now it came out of the Tabernacle. At that time it signaled that G’d had “descended” into the domain of earth, i.e. on top of Mount Sinai, whereas now it signaled that G’d had taken up residence in His home on earth, the Mishkan. At a later stage, after G’d had limited His presence to the Holy of Holies, we hear in Numbers 7,89 that His voice was heard originating from above the kapporet, the lid of the Holy Ark, between the two cherubs. At the earliest stage of G’d communicating with Moses His voice originated in the burning bush, the site of Mount Sinai, also, as we know from Exodus 3,4. לאמור, there is a repetition here, i.e. וידבר and לאמור although both address the same subject. We explained this phenomenon in Genesis 8,15 This phenomenon occurs again also with Aaron in Numbers 8,2. [the author may refer to these phenomena to draw attention to his differing with the commentary of Torat Kohanim quoted by Rashi. Ed.] [The author’s understanding of the meaning of לאמור is that it is a repetition, emphasisng the preceding words, such as ויצו, or ויקרא. Ed]