The avoidance of the original name of God both in speech and, to a certain extent, in the Bible was due, according to Geiger ("Urschrift," p. 262), to a reverence which shrank from the utterance of the Sublime Name; and it may well be that such a reluctance first arose in a foreign, and hence in an "unclean" land, very possibly, therefore, in Babylonia. According to Dalman (l.c. pp. 66 et seq.), the Rabbis forbade the utterance of the Tetragrammaton, to guard against desecration of the Sacred Name; but such an ordinance could not have been effectual unless it had met with popular approval. The reasons assigned by Lagarde ("Psalterium Hicronymi," p. 155) and Halévy ("Recherches Bibliques," i. 65 et seq.) are untenable, and are refuted by Jacob (l.c. pp. 172, 174), who believes that the Divine Name was not pronounced lest it should be desecrated by the heathen. The true name of God was uttered only during worship in the Temple, in which the people were alone; and in the course of the services on the Day of Atonement the high priest pronounced the Sacred Name ten times (Tosef., Yoma, ii. 2; Yoma 39b). This was done as late as the last years of the Temple (Yer. Yoma 40a, 67). If such was the purpose, the means were ineffectual, since the pronunciation of the Tetragrammaton was known not only in Jewish, but also in non-Jewish circles centuries after the destruction of the Temple, as is clear from the interdictions against uttering it (Sanh. x. 1; Tosef., Sanh. xii. 9; Sifre Zuṭa, in Yalḳ., Gen. 711; 'Ab. Zarah 18a; Midr. Teh. to Ps. xci., end). Raba, a Babylonian amora who flourished about 350, wished to make the pronunciation of the Tetragrammaton known publicly (Ḳid. 71b); and a contemporary Palestinian scholar states that the Samaritans uttered it in taking oaths (Yer. Sanh. 28b). The members of the Babylonian academy probably knew the pronunciation as late as 1000 C. E. (Blau, l.c. pp. 132 et seq., 138 et seq.). The physicians, who were half magicians, made special efforts to learn this name, which was believed to possess marvelous powers (of healing, etc.; Yer. Yoma 40a, below).