To vow for something not possessed, and for something sinful
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ حُمَيْدٍ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِنَّ اللَّهَ لَغَنِيٌّ عَنْ تَعْذِيبِ هَذَا نَفْسَهُ ". وَرَآهُ يَمْشِي بَيْنَ ابْنَيْهِ. وَقَالَ الْفَزَارِيُّ عَنْ حُمَيْدٍ حَدَّثَنِي ثَابِتٌ عَنْ أَنَسٍ
Narrated Anas: The Prophet (ﷺ) said, "Allah is not in need of this man) torturing himself," when he saw the man walking between his two sons (who were supporting him).