Tzedakah or Ṣ'daqah in Classical Hebrew (; ), is a Hebrew word literally meaning justice or righteousness but commonly used to signify charity, though it is a different concept from charity because tzedakah is an obligation and charity is typically understood as a spontaneous act of goodwill and a marker of generosity. It is based on the Hebrew word (צדק, Tzedek) meaning righteousness, fairness or justice, and it is related to the Hebrew word Tzadik meaning righteous as an adjective (or righteous individual as a noun in the form of a substantive). In Judaism, tzedakah refers to the religious obligation to do what is right and just, which Judaism emphasises are important parts of living a spiritual life. Maimonides says that, while the second highest form of tzedakah is to give donations anonymously to unknown recipients, the highest form is to give a gift, loan, or partnership that will result in the recipient supporting himself instead of living upon others. Unlike philanthropy or charity, which is completely voluntary, tzedakah is seen as a religious obligation, which must be performed regardless of financial standing, and must even be performed by poor people. Tzedakah is considered to be one of the three main acts that can annul a less than favorable heavenly decree. The term is synonymous with Sadaqah or Saddka (Arabic: صدقة ), an Islamic term meaning "voluntary charity".