Whoever causes harm will be harmed by Allah, and whoever causes hardship will be put in hardship by Allah
Abu Sirmah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said:
"Whoever causes harm will be harmed by Allah, and whoever causes hardship will be put in hardship by Allah."
«مَنْ ضَارَّ ضَارَّ اللهُ بِهِ، وَمَنْ شَاقَّ شَقَّ اللهُ عَلَيْهِ».
The Prophet (may Allah's peace and blessings be upon him) warned against causing harm or hardship to a Muslim in any matter, in himself, his wealth, or his family, and that whoever does so, Allah will subject him to a punishment similar to his action.
...:
It is prohibited to harm Muslims or put them in hardship.
Allah Almighty takes revenge for His servants.
Sunan Abi Dawood (5/ 477) (3635).
Sunan At-Tirmidhi (3/ 495) (1940).
Sunan Ibn Mājah (3/ 432) (2342).
Musnad Ahmad (25/ 34) (15755).
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مساوئ الأخلاق.
للخرائطي (ص: 274) (583).
توضيح الأحكام مِن بلوغ المرام.
للبسام (7/ 445).
فتح ذي الجلال والإكرام شرح بلوغ المرام.
لابن عثيمين (6/ 396).
منحة العلام في شرح بلوغ المرام.
لعبد الله الفوزان (10/ 261).