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
bayhaqi:8330 – Abū al-Ḥusayn b. Bishrān> Ismāʿīl b. Muḥammad al-Ṣaffār > Saʿdān b. Naṣr > Wakīʿ > ʿAbdullāh b. Nāfiʿ a freed slave of Ibn ʿUmar from his father > Ibn ʿUmar

[Machine] That he used to joke while fasting.  

البيهقي:٨٣٣٠ – أَخْبَرَنَا أَبُو الْحُسَيْنِ بْنُ بِشْرَانَ بِبَغْدَادَ أنبأ إِسْمَاعِيلُ بْنُ مُحَمَّدٍ الصَّفَّارُ ثنا سَعْدَانُ بْنُ نَصْرٍ ثنا وَكِيعٌ عَنْ عَبْدِ اللهِ بْنِ نَافِعٍ مَوْلَى ابْنِ عُمَرَ عَنْ أَبِيهِ عَنِ ابْنِ عُمَرَ

أَنَّهُ كَانَ يَسْتَاكُ وَهُوَ صَائِمٌ  

See similar narrations below:

Collected by Abū Dāwūd
abudawud:2378 – And Hb b. Baqiyyah > Abū Muʿāwiyah > ʿUtbah > Abū Muʿādh > ʿUbaydullāh b. Abū Bakr b. Anas > Anas b. Mālik

'Ubaid Allah b. Abu Bakr b. Anas reported on the authority of Anas b. Malik that he used to apply collyrium when he was fasting.  

أبو داود:٢٣٧٨ – حَدَّثَنَا وَهْبُ بْنُ بَقِيَّةَ أَخْبَرَنَا أَبُو مُعَاوِيَةَ عَنْ عُتْبَةَ عَنْ أَبِي مُعَاذٍ عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ أَنَسٍ عَنْ أَنَسِ بْنِ مَالِكٍ

أَنَّهُ كَانَ يَكْتَحِلُ وَهُوَ صَائِمٌ