Monasticism is seclusion from people and abandoning them in monasteries and places of worship to worship Allah.
Monasticism is something which the people imposed upon themselves for which Allah never gave them any warrant.
(Then We sent following their footsteps Our messengers and followed [them] with Jesus, the son of Mary, and gave him the Gospel. And We placed in the hearts of those who followed him compassion and mercy and monasticism, which they innovated; We did not prescribe it for them except [that they did so] seeking the approval of Allah . But they did not observe it with due observance. So We gave the ones who believed among them their reward, but many of them are defiantly disobedient.) Al-Hadid 57:27
(We did not prescribe it for them:) It means that Allah has not prescribed it, instead they did that themselves, they innovated, believed in it, and then prescribed it for themselves.
(But they did not observe it with due observance): means they did not carry out Allah’s commands, and Allah gave whoever fulfilled his pledge a great reward, and most of them did not deserve the reward as they did not fulfill their pledge.
الرهبانية هي اعتزال الناس و الإنقطاع عنهم في الأديرة و الصوامع و دور العبادات لعبادة الله.
الرهبانية فرضها الناس على أنفسهم دون أمر من الله.
ثُمَّ قَفَّيْنَا عَلَىٰ آثَارِهِم بِرُسُلِنَا وَقَفَّيْنَا بِعِيسَى ابْنِ مَرْيَمَ وَآتَيْنَاهُ الْإِنجِيلَ وَجَعَلْنَا فِي قُلُوبِ الَّذِينَ اتَّبَعُوهُ رَأْفَةً وَرَحْمَةً وَرَهْبَانِيَّةً ابْتَدَعُوهَا مَا كَتَبْنَاهَا عَلَيْهِمْ إِلَّا ابْتِغَاءَ رِضْوَانِ اللَّـهِ فَمَا رَعَوْهَا حَقَّ رِعَايَتِهَا ۖ فَآتَيْنَا الَّذِينَ آمَنُوا مِنْهُمْ أَجْرَهُمْ ۖ وَكَثِيرٌ مِّنْهُمْ فَاسِقُونَ ﴿٢٧
الحديد 57: 27
مَا كَتَبْنَاهَا عَلَيْهِمْ: لم يفرضها الله عليهم لكنهم ابتدعوها و نذروها و فرضوها على أنفسهم.)
رَعَوْهَا حَقَّ رِعَايَتِهَا: أي لم يقوموا بأمر الله كما نذروا فأعطى الله من أوفى بنذره أجرا و كثير من أولئك لم يستحق أجرا لأنه لم يوف بما نذر.)