March forth, whether you are light (being healthy, young and wealthy) or heavy (being ill, old and poor), strive hard with your wealth and your lives in the Cause of Allâh. This is better for you, if you but knew.
[Surat at-Tawbah, 9:41; tafseer here]
`Ali bin Zayd narrated that Anas said:
Abu Talhah commented (on this Ayah),
“Whether you are old or young, Allah did not leave an excuse for anyone.”
Abu Talhah marched to Ash-Shaam and fought until he was killed.
In another narration:
Abu Talhah recited Surah Bara’ah until he reached the above Ayah.
He then said, “I see that Allah had called us to mobilize whether we are old or young. O my children! Prepare my supplies.”
His children said, “May Allah grant you His mercy! You conducted Jihad along with the Messenger of Allah until he died, then with Abu Bakr until he died, then with `Umar until he died. Let us perform Jihad in your place.”
Abu Talhah refused and he went to the sea under the command of Mu’awiyah where he died.
They could not find an island to bury him on until nine days later, during which his body did not deteriorate or change and they buried him on the island.
Source: Tafseer ibn Katheer