Sayyiduna Abu Huraira (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) passed by a man who was selling grain. The Prophet (peace and blessings be upon him) liked the grain, so he put his blessed hand into it, and found that there was wet grain mixed in it. The Prophet (peace and blessings be upon him) said: "Whoever mixes (adulterates), he is not from us."