Messenger of Allah ﷺ once delayed the ʿIsha' prayer and that was during the days when Islam still had not spread. The Prophet ﷺ did not come out till ʿUmar informed him that the women and children had slept. Then he came out and said to the people of the mosque: "None amongst the dwellers of the earth has been waiting for it (ʿIsha prayer) except you."  

أَعْتَمَ رَسُولُ اللَّهِ ﷺ لَيْلَةً بِالْعِشَاءِ وَذَلِكَ قَبْلَ أَنْ يَفْشُوَ الإِسْلاَمُ فَلَمْ يَخْرُجْ حَتَّى قَالَ عُمَرُ نَامَ النِّسَاءُ وَالصِّبْيَانُ فَخَرَجَ فَقَالَ لأَهْلِ الْمَسْجِدِ مَا يَنْتَظِرُهَا أَحَدٌ مِنْ أَهْلِ الأَرْضِ غَيْرُكُمْ  

My companions, who came with me in the boat and I landed at a place called Baqi [??] Buthan [??] . The Prophet ﷺ was in Medina at that time. One of us used to go to the Prophet ﷺ by turns every night at the time of the ʿIsha prayer. Once I along with my companions went to the Prophet ﷺ and he was busy in some of his affairs, so the ʿIsha' prayer was delayed to the middle of the night He then came out and led the people (in prayer). After finishing from the prayer, he addressed the people present there saying, "Be patient! Don't go away. Have the glad tiding. It is from the blessing of Allah upon you that none amongst mankind has prayed at this time save you." Or said, "None except you has prayed at this time." Abu Musa added, 'So we returned happily after what we heard from Messenger of Allah ﷺ ."  

كُنْتُ أَنَا وَأَصْحَابِي الَّذِينَ قَدِمُوا مَعِي فِي السَّفِينَةِ نُزُولاً فِي بَقِيعِ بُطْحَانَ وَالنَّبِيُّ ﷺ بِالْمَدِينَةِ فَكَانَ يَتَنَاوَبُ النَّبِيَّ ﷺ عِنْدَ صَلاَةِ الْعِشَاءِ كُلَّ لَيْلَةٍ نَفَرٌ مِنْهُمْ فَوَافَقْنَا النَّبِيَّ عليه السلام أَنَا وَأَصْحَابِي وَلَهُ بَعْضُ الشُّغْلِ فِي بَعْضِ أَمْرِهِ فَأَعْتَمَ بِالصَّلاَةِ حَتَّى ابْهَارَّ اللَّيْلُ ثُمَّ خَرَجَ النَّبِيُّ ﷺ فَصَلَّى بِهِمْ فَلَمَّا قَضَى صَلاَتَهُ قَالَ لِمَنْ حَضَرَهُ عَلَى رِسْلِكُمْ أَبْشِرُوا إِنَّ مِنْ نِعْمَةِ اللَّهِ عَلَيْكُمْ أَنَّهُ لَيْسَ أَحَدٌ مِنَ النَّاسِ يُصَلِّي هَذِهِ السَّاعَةَ غَيْرُكُمْ أَوْ قَالَ مَا صَلَّى هَذِهِ السَّاعَةَ أَحَدٌ غَيْرُكُمْ لاَ يَدْرِي أَىَّ الْكَلِمَتَيْنِ قَالَ قَالَ أَبُو مُوسَى فَرَجَعْنَا فَفَرِحْنَا بِمَا سَمِعْنَا مِنْ رَسُولِ اللَّهِ ﷺ