"Al-Hajjaj arrived, and we asked Jabir bin 'Abdullah, who said: 'The Messenger of Allah ﷺ prayed Zuhr at the time of intense heat, [1] and 'Asr when the sun was white and clear, and Maghrib when the sun set, and with 'Isha' it would depend - if he saw that the people had gathered, he would pray early, and if he saw that they had not come yet, he would delay it.'" [1] Meaning, at the earliest time. (Using translation from Nasāʾī 527)  

كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي الظُّهْرَ بِالْهَاجِرَةِ وَالْعَصْرَ وَالشَّمْسُ بَيْضَاءُ نَقِيَّةٌ وَالْمَغْرِبَ إِذَا وَجَبَتِ الشَّمْسُ وَالْعِشَاءَ أَحْيَانًا كَانَ إِذَا رَآهُمْ قَدِ اجْتَمَعُوا عَجَّلَ وَإِذَا رَآهُمْ قَدْ أَبْطَأُوا أَخَّرَ