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.
bayhaqi:9135Abū Naṣr b. Qatādah > Abū al-Faḍl b. Khumayrawayh > Aḥmad b. Najdah > Muḥammad b. ʿAbdullāh b. Numayr from my father > ʿUbaydullāh > Sālim > ʿAbdullāh b. ʿUmar

[Machine] It is said that Aasim ibn Umar and Abdul Rahman ibn Zaid were swimming in the sea, and they were taking turns submerging each other's heads under water. Umar was watching them, and he did not criticize their actions.  

البيهقي:٩١٣٥أَخْبَرَنَا أَبُو نَصْرِ بْنُ قَتَادَةَ ثنا أَبُو الْفَضْلِ بْنُ خُمَيْرَوَيْهِ أنبأ أَحْمَدُ بْنُ نَجْدَةَ ثنا مُحَمَّدُ بْنُ عَبْدِ اللهِ بْنِ نُمَيْرٍ ثنا أَبِي ثنا عُبَيْدُ اللهِ عَنْ سَالِمٍ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ

أَنَّ عَاصِمَ بْنَ عُمَرَ وَعَبْدُ الرَّحْمَنِ بْنُ زَيْدٍ وَقَعَا فِي الْبَحْرِ يَتَمَاقَلَانِ يُغَيِّبُ أَحَدُهُمَا رَأْسَ صَاحِبِهِ وَعُمَرُ يَنْظُرُ إِلَيْهِمَا فَلَمْ يُنْكِرْ ذَلِكَ عَلَيْهِمَا