It is narrated from Sayyiduna Dhu al-Asabi' (may Allah be pleased with him) that he said: O Messenger of Allah, if we are tried with remaining alive after you, what do you command us? He (peace and blessings be upon him) said: "Hold fast to Bayt al-Maqdis; perhaps Allah will grant you offspring who will go to it morning and evening."
Hadith Referenceالمعجم الكبير للطبراني / باب الذال / 4222