"There are three times that the Messenger of Allah prohibited us from performing Salat in, burying our dead in: When the sun's rising appears until it has risen up; when the sun is at the zenith until it passes, and when the sun begins its setting, until it has set."  

ثَلاَثُ سَاعَاتٍ كَانَ رَسُولُ اللَّهِ ﷺ يَنْهَانَا أَنْ نُصَلِّيَ فِيهِنَّ أَوْ نَقْبُرَ فِيهِنَّ مَوْتَانَا حِينَ تَطْلُعُ الشَّمْسُ بَازِغَةً حَتَّى تَرْتَفِعَ وَحِينَ يَقُومُ قَائِمُ الظَّهِيرَةِ حَتَّى تَمِيلَ وَحِينَ تَضَيَّفُ الشَّمْسُ لِلْغُرُوبِ حَتَّى تَغْرُبَ