It is narrated from Sayyiduna Talq (may Allah be pleased with him) that a man asked the Messenger of Allah (peace and blessings be upon him): "If a person touches his private part, should he perform ablution because of it?" The Prophet (peace and blessings be upon him) replied: "It is only a piece of flesh from your body."
(Second chain) Sayyiduna Taliq (may Allah be pleased with him) says: I was sitting with the Noble Prophet (peace and blessings be upon him), when a man asked him: I have touched my private part, or if a man touches his private part during prayer, should he perform ablution again? The Prophet (peace and blessings be upon him) said: No, it is only a part of your body.
(Third chain) It is narrated from Sayyiduna Talq (may Allah be pleased with him) that a man said: O Messenger of Allah! If one of us touches his private part during prayer, should he perform ablution? The Prophet (peace and blessings be upon him) said: It is only a part of your body, (there is no need to perform ablution because of it).