Sayyiduna Abu Umamah (may Allah be pleased with him) asked the Prophet (peace and blessings be upon him): At what time is prayer disliked? He (peace and blessings be upon him) said: "From when you pray Fajr until the sun has risen the height of one spear, and from when the sun turns yellow until it sets."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 8077