The mention of 'Isha' and 'Atama and whoever took the two names as one and the same

قَالَ أَبُو هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَثْقَلُ الصَّلاَةِ عَلَى الْمُنَافِقِينَ الْعِشَاءُ وَالْفَجْرُ». وَقَالَ: «لَوْ يَعْلَمُونَ مَا فِي الْعَتَمَةِ وَالْفَجْرِ». قَالَ أَبُو عَبْدِ اللَّهِ وَالاِخْتِيَارُ أَنْ يَقُولَ الْعِشَاءُ لِقَوْلِهِ تَعَالَى: {وَمِنْ بَعْدِ صَلاَةِ الْعِشَاءِ}. وَيُذْكَرُ عَنْ أَبِي مُوسَى قَالَ كُنَّا نَتَنَاوَبُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عِنْدَ صَلاَةِ الْعِشَاءِ فَأَعْتَمَ بِهَا. وَقَالَ ابْنُ عَبَّاسٍ وَعَائِشَةُ أَعْتَمَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِالْعِشَاءِ. وَقَالَ بَعْضُهُمْ عَنْ عَائِشَةَ أَعْتَمَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِالْعَتَمَةِ. وَقَالَ جَابِرٌ كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُصَلِّي الْعِشَاءَ. وَقَالَ أَبُو بَرْزَةَ كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُؤَخِّرُ الْعِشَاءَ. وَقَالَ أَنَسٌ أَخَّرَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْعِشَاءَ الآخِرَةَ. وَقَالَ ابْنُ عُمَرَ وَأَبُو أَيُّوبَ وَابْنُ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمْ صَلَّى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْمَغْرِبَ وَالْعِشَاءَ.Narrated Abu Hurairah رضي الله عنه: The Prophet ﷺ said, "The most difficult and the hardest Salat (prayers) for the hypocrites are the Isha' (prayer) and the Fajr (prayer)." He added, "Had they known what is (the reward of) the Atama ('Isha') and the Fajr (prayers) they would have come to attend them even if they had to crawl." Few discussions about Maghrib, 'Atama i.e. 'Isha', which are merely repetition of the topic of this chapter, are mentioned here in the Arabic text. Abu Abdullah (Bukhari) said: It is better that one should call it Isha because of the words of Allah, the Most High: “…and after the Isha prayer” (the Quran, 24:58). It has been related of Abu Musa that he said: We used to take turns to be with the Prophet ﷺ at Isha prayer and he would say it late. Ibn Abbas and Aishah said: The Prophet ﷺ delayed the Isha prayer. Some reported from Aishah that the Prophet ﷺ delayed the Atamah prayer. Jabir said: The Prophet ﷺ used to say the Isha prayer. Abu Barzah said: The Prophet ﷺ used to delay the Isha prayer. Anas said: The Prophet ﷺ delayed the late Isha prayer. Ibn Umar, Abu Ayyub and Ibn Abbas said: The Prophet ﷺ said the Maghrib and the Isha prayers.