The Holy Prophet Muhammad [Peace be upon Him] has observed: “Let that man be disgraced, and disgraced again and let him be disgraced even more.” The Sahaabah’s inquired: “O Prophet of Rasoolul Laah [Sallal Laahu Alaieh Wa Sallam]!! Who is that man?” The Prophet said:
“I refer to the man who finds his parents old in age – both of them or one of them – and yet did not earn entitlement to Paradise by rendering good service to them.”
Hazrat ‘Abdul laah ibn ‘Amr [Radiyal Laahu Anhu] relates that a person came to the presence of the Holy Prophet (peace and blessings of Allaah Kareem he upon him) with the intention of participating in the Jihaad. The Holy Prophet enquired from him : “Are your father and mother alive?” He said “Yes, they are alive”. The Holy Prophet (peace and blessings be upon him) said: “Go and render good service to them. This is the Jihaad”.
[Saheeeh al-Bukhaari, Muslim]