Musnad Ahmad 32:69

Ibn Abi ‘Adi narrated to us, Humayd narrated to us, from Anas, who said: When the Messenger of Allah (peace and blessings of Allah be upon him) returned from the expedition of Tabuk and drew near to Medina, he said: "Indeed, there are people in Medina who did not travel a journey, nor did they cross a valley, but they were with you in it." They said: "O Messenger of Allah, even though they were in Medina?" He said: "Even though they were in Medina; the excuse held them back."