"Israel encamped there in front of the mountain, and Moses went up to God" (Exodus, 19:2). As our Sages, of blessed memory said on "Israel encamped there", they became as a single person, in single unity and by so doing, were granted the privilege of receiving the Torah. It also says that Moses was granted the privilege of receiving the Torah uniquely because of his humility. This explains the Tanah's intended meaning in "Moses received the Torah from Sinai"; it means that Moses chose Sinai because of its humble [proportions], and also out being humble himself. This is also what is meant by "Israel encamped there" - in front of the humble mountain. Also, Israel were in single unity, which could only be attained through humility, which is why they were granted the privilege of receiving the Torah.