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Nama Japam or Nama Sankeertanam is the japa (repetition) or Sankirtana of nama (name) of the Almighty. The devotee chooses Ishta-deva or Ishta devata (Sanskrit iṣṭa-deva(tā), literally "cherished divinity" from iṣṭa "desired, liked, cherished" and devatā "godhead, divinity," or deva "deity") and picks up a name of the Ishta deva to repeatedly chant the name vocally or in the mind any time, anywhere. Devotees can form a group and do sankeertanam or singing together of name of the Almighty.
Adi Sankaracharya, the Advaita enlightened master, in verse 27 of his hymn, Bhaja Govindam, said that the Gita and Vishnu sahasranama should be chanted and the form of the Lord of Lakshmi-Narayana should always be meditated on. He also said that the Sahasranama bestowed all noble virtues on those who chanted it.
The Almighty has mentioned in Srimad Bhagawad Gita, that He resides in the hearts of those who chant and sing His namas.