Man Lā Yaḥḍuruh al-Faqīh
Hadith 11601167 - وَ رَوَى مُحَمَّدُ بْنُ مُسْلِمٍ عَنْ أَحَدِهِمَا عَلَيْهِمَا اَلسَّلاَمُ: فِي اَلرَّجُلِ يَدْخُلُ اَلْمَسْجِدَ فَيَخَافُ أَنْ تَفُوتَهُ اَلرَّكْعَةُ قَالَ «يَرْكَعُ قَبْلَ أَنْ يَبْلُغَ إِلَى اَلْقَوْمِ وَ يَمْشِي وَ هُوَ رَاكِعٌ حَتَّى يَبْلُغَهُمْ.
Hadith.1167 - Muhammad ibn Muslim narrated from one of the Imams (as) regarding a man who enters the mosque and fears that he will miss the rak'ah (unit of prayer).
Imam (as) said: "He should bow (in ruku') before reaching the congregation and then walk while in the bowing position until he joins them."