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.
malik:9-70Mālik > Nāfiʿ

Yahya related to me from Malik from Nafi that Ibn Umar would never turn around when praying.  

مالك:٩-٧٠وَحَدَّثَنِي عَنْ مَالِكٍ عَنْ نَافِعٍ

أَنَّ ابْنَ عُمَرَ لَمْ يَكُنْ يَلْتَفِتُ فِي صَلاَتِهِ