It is narrated from Sayyiduna Zayd bin Harithah (may Allah be pleased with him) that a man asked the Prophet (peace and blessings be upon him) about the time of the Fajr prayer, and he (peace and blessings be upon him) said: "Pray with us today and tomorrow." So when the Messenger of Allah (peace and blessings be upon him) was at Qa' Namirah near al-Juhfah, he (peace and blessings be upon him) prayed it as soon as the dawn began; and when he reached Dhu Tuwa, he delayed the prayer, until people began to say: Has the Messenger of Allah (peace and blessings be upon him) passed away? If only we had prayed! He (peace and blessings be upon him) led the prayer before the sun rose, then turned to the people and said: "What did you say?" The people said: We were saying: If only we had prayed. He (peace and blessings be upon him) said: "Had you done so, a punishment would have struck you." Then he (peace and blessings be upon him) called the questioner and said: "Its time is between these two prayers of mine."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4653