I came to the Prophet and said, "O Messenger of Allah, I want to perform Jihad in the way of Allah. He asked, "Is your mother alive?" I replied, "Yes." The Prophet then said: "Cling to her feet, because paradise is there." (at-Tabarânî).

Shaykh Nidhaam Sakkijihaa comments:

Cling to her feet means to submit yourself to her, be close to her, protect her, serve her because in this is Paradise and with her satisfaction you will enjoy the good blessings of Allah. (Sakkijihaa, Honoring the Parents, p. 52)

The Prophet Muhammad (peace and blessings be upon him) showed us the importance of serving one's parents in the following narration reported by Abdullah Ibn Mas'ud.