ויקרא כה,א: בְהַּר סִינַּי
Baal HaTurim: This passage with the phrase “on Har Sinai” follows the commandment “not to take the name of HaShem in vain”. This is according to what is related in the Gemara Kiddushin, “once every seven years the Chachumim would transit to their students the knowledge of the Tetragammaton. Thus, the passage regarding the name of HaShem was placed next to the passage about the seven-year cycle of shmittah.
The Tetragrammaton is the Name of four letters: י-ה-ו-ה. Other than in the Bais HaMikdash, this Name is never pronounced as it is written. Rather during times of prayer, beracha, Torah reading, etc. it is pronounced Adon-ai. Even inside the Bais HaMikdash, the Kohanim only pronounced as it is written during the Priestly blessing. The Gemara speaks of the esoteric meaning of that Name when it is pronounced as it is spelled.
