Sayyiduna Sahl bin Mu'adh narrates from his father that the Messenger of Allah (peace and blessings be upon him) sent out an expedition, and a woman came to him (peace and blessings be upon him) and said: O Messenger of Allah! You have sent out this expedition and my husband is also in it. I used to fast when he fasted, pray when he prayed and worship as he worshipped. So tell me of a deed by which I may reach (the reward of) his deed. He (peace and blessings be upon him) said: "Keep praying (continuously) and never sit down, keep fasting (continuously) and never break your fast, and keep remembering (Allah continuously) and never slacken." She said: O Messenger of Allah! Will I be able to do that? He (peace and blessings be upon him) said: "Even if you were given the strength for it, by the One in whose hand is my soul, you would not reach even a tenth of his deed." This hadith has a sahih (authentic) chain, but the two Shaykhs did not record it.