No, this is not true. His RIBA is a major sin and these good deeds are something separate and different. The khawarij were described to us by our Prophet to be in great lengths of prayers and reciting the Quran. However, we are told that they are the hounds of hell-fire.

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This is not permissible as it involves riba. If he sells you what he has in his possession by a fixed price that is a lump sum whiteout the possibility to ever increase the agreed price even one dime,  this is permissible.

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