Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:23454a –
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السيوطي:٢٣٤٥٤a –

"مَنْ وَعَدَ مِنكُمْ رَجُلًا عِدَةً وَمِنْ نِيَّتِهِ أَنْ يَفِي بِذَلِكَ فَلَمْ يَفِ لِمَوْعِدهِ فَلا إِثْمَ عَلَيهِ".  

[هب] البيهقى في شعب الإيمان عن زيد بن أرقم

See similar narrations below:

Collected by Suyūṭī
suyuti:2769a –

The Prophet ﷺ said: When a man makes a promise to his brother with the intention of fulfilling it and does not do so, and does not come at the appointed time, he is guilty of no sin. (Using translation from Abū Dāʾūd 4995)   

السيوطي:٢٧٦٩a –

"إذَا وَعَدَ الرَّجلُ أخاهُ ومِنْ نيَّتِهِ أنْ يَفِى لهُ فَلمْ يَفِ ولَمْ يجئْ للميعادِ فلا إثمَ عليهِ".  

[د] أبو داود ، [ت] الترمذي وضعَّفه ، [طب] الطبرانى في الكبير [ق] البيهقى في السنن عن زيد بن أرقم