Aflah, the freed slave of Abu Ayyub (may Allah have mercy on him), narrates that he passed by Sayyiduna Zayd bin Thabit and Sayyiduna Abu Ayyub (may Allah be pleased with them both) while the two of them were sitting by Masjid al-Jana'iz. One of them said to his companion: Do you remember the hadith that the Messenger of Allah (peace and blessings be upon him) narrated to us in this very gathering in which we are sitting? He said: Yes, about Madinah. I heard him (peace and blessings be upon him) saying that a time will come upon people in which regions of the earth will be conquered, and some men will go out to them and find ease, a comfortable life and food there. Then they will pass by their brothers who have come for Hajj or Umrah and say to them: What keeps you in the hardship of living and severe hunger? The Messenger of Allah (peace and blessings be upon him) said: "So some will go and some will stay" (he (peace and blessings be upon him) repeated this several times) "and Madinah is better for them. No one stays firmly in it and bears patiently its hardship and severity until he dies, except that I will be a witness or an intercessor for him on the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3970