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:20525a –
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السيوطي:٢٠٥٢٥a –

"مَنْ أَسْلَفَ في شَيءٍ فَلَا يَشْتَرط غَيرَ قَضَائِه".  

أَبو نعيم عن ابن عمر

See similar narrations below:

Collected by Mālik
malik:31-95 – Mālik > Nāfiʿ > ʿAbdullāh b. ʿUmar

Yahya related to me from Malik from Nafi that he heard Abdullah ibn Umar say, "If someone lends something, let the only condition be that it is repaid."  

مالك:٣١-٩٥ – وَحَدَّثَنِي مَالِكٌ عَنْ نَافِعٍ أَنَّهُ سَمِعَ عَبْدَ اللَّهِ بْنَ عُمَرَ

يَقُولُ مَنْ أَسْلَفَ سَلَفًا فَلاَ يَشْتَرِطْ إِلاَّ قَضَاءَهُ