It is said in the oldest Upanishad that he must perform sacrifices after acquiring wealth by honest means. He should spend it in charity; he should be hospitable to all that would come to his house; he should never use anything without giving a portion to others.
धर्मागतं प्राप्य धनं यजेत दद्यात् सदैवातिथीन् भोयजेच्च। अनाददानश्च परैरदत्तं सैषा गृहस्थोपनिषत् पुराणी॥