Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) states that when the Prophet (peace and blessings be upon him) sent him to Yemen, the Prophet (peace and blessings be upon him) went out with him, giving him advice. Sayyiduna Mu'adh (may Allah be pleased with him) was riding while the Prophet (peace and blessings be upon him) was walking. When he had finished the advice, he said: "O Mu'adh, it may be that you will not meet me after this year of mine, and perhaps you will pass by my mosque and my grave."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20151