عَنْ بِلَالٍ (بْنِ رِبَاحٍ) رَضِيَ اللَّهُ عَنْهُ قَالَ: لَمْ يَكُنْ يُنْهَى عَنِ الصَّلَاةِ إِلَّا عِنْدَ طُلُوعِ الشَّمْسِ فَإِنَّهَا تَطْلُعُ بَيْنَ قَرْنَي الشَّيْطَانِ
It is narrated from Sayyiduna Bilal bin Rabah (may Allah be pleased with him), he says: There was no prohibition from performing prayer at any time, except at the time of sunrise, because it rises between the horns of Satan.