Bibliography
- Lazarus, Ethics of Judaism, §§ 246-256.
- L. Dukes, Zur Kenntniss der Neuhebräischen Poesie, 1842, pp. 8 et seq.;
- Goldziher, Del' Ascétisme, in Revue del' Histoire des Religions, 1898, pp. 314 et seq.;
- Nöldeke, Sufi, in Z. D. M. G. xlviii. 45-47
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