There were three times at which the Messenger of Allah ﷺ used to forbid us to pray or bury our dead - when the sun begins to rise till it is fully up, when the sun is at its height midway till it passes the meridian, and when the sun draws near to setting till it sets, or as he said. (Using translation from Abū Dāʾūd 3192)  

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

Some reliable people testified before me, and among them was Umar ibn al-Khattab, and most reliable in my eyes was Umar: The Prophet of Allah ﷺ said: There is no prayer after the dawn prayer until the sun rises; and there is no prayer after the 'Asr prayer until the sun sets. (Using translation from Abū Dāʾūd 1276)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «لَا صَلَاةَ بَعْدَ صَلَاةِ الصُّبْحِ حَتَّى تَطْلُعَ الشَّمْسُ وَلَا صَلَاةَ بَعْدَ صَلَاةِ الْعَصْرِ حَتَّى تَغْرُبَ الشَّمْسُ»