Allah the Exalted has said:
رياض الصالحينAbū Zakariyyā Muḥyī al-Dīn Yaḥyā ibn Sharaf al-Nawawī٤٨ - باب التحذير من إيذاء الصالحين والضعفة والمساكين
٤٨ - باب التحذير من إيذاء الصالحين والضعفة والمساكين
And those who harm believing men and believing women for [something] other than what they have earned [i.e., deserved] have certainly borne upon themselves a slander and manifest sin.
And the Exalted has also said:
فَأَمَّا ٱلْيَتِيمَ فَلَا تَقْهَرْ
So as for the orphan, do not oppress [him].
وأما الأحاديث، فكثيرة مِنْهَا:
As for the hadiths, they are many; among them:
حديث أَبي هريرة - ﵁ - في الباب قبل هَذَا: «مَنْ عَادَى لِي وَليًّا فَقَدْ آذَنْتُهُ بِالحَرْبِ».
The hadith of Abū Hurayrah (may Allah be pleased with him) in the chapter before this: "Whoever shows enmity to a friend (walī) of Mine, I have declared war upon him."
ومنها حديث سعد بن أَبي وقاص - ﵁ - السابق في باب ملاطفة اليتيم، وقوله ﷺ: «يَا أَبَا بَكْرٍ، لَئِنْ كُنْتَ أَغْضَبْتَهُمْ لَقَدْ أَغْضَبْتَ رَبَّكَ».
And among them is the hadith of Saʿd ibn Abī Waqqāṣ (may Allah be pleased with him), mentioned earlier in the chapter on gentle kindness to the orphan, and his ﷺ saying: "O Abū Bakr, if you have angered them, then you have indeed angered your Lord."
وعن جندب بن عبد الله - ﵁ - قَالَ: قَالَ رَسُول الله - ﷺ: «مَنْ صَلَّى صَلاةَ الصُّبْحِ، فَهُوَ في ذِمَّةِ اللهِ، فَلاَ يَطْلُبَنَّكُمُ اللهُ مِنْ ذِمَّتِهِ بِشَيْءٍ، فَإنَّهُ مَنْ يَطْلُبُهُ مِنْ ذِمَّتِهِ بِشَيْءٍ يُدْرِكْهُ، ثُمَّ يَكُبُّهُ عَلَى وَجْهِهِ في نَارِ جَهَنَّمَ». رواه مسلم.
Jundub ibn ʿAbd Allāh (may Allah be pleased with him) reported: The Messenger of Allah ﷺ said: "Whoever prays the dawn prayer is under the protection (dhimmah) of Allah. So let Allah not call you to account for anything of His protection, for whoever Allah pursues for anything of His protection, He will overtake him, then cast him upon his face into the Fire of Hell." Narrated by Muslim.