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:4540Abū al-Ḥasan Muḥammad b. al-Ḥusayn al-Qaṭṭān > ʿAbdullāh b. Jaʿfar > Yaʿqūb b. Sufyān > ʿAmr b. Marzūq > Shuʿbah > Saʿd b. Ibrāhīm > Ḥafṣ b. ʿĀṣim > Ibn Buḥaynah

[Machine] The Messenger of Allah saw a man praying two units of prayer and the prayer had already been established. So the Messenger of Allah asked, "Is Fajr (dawn prayer) four units?" Ya'qub As-Sahih said, "Yes, this is correct, and Ibrahim was mistaken in his statement about his father."  

البيهقي:٤٥٤٠وَأَخْبَرَنَا أَبُو الْحَسَنِ مُحَمَّدُ بْنُ الْحُسَيْنِ الْقَطَّانُ أنبأ عَبْدُ اللهِ بْنُ جَعْفَرٍ ثنا يَعْقُوبُ بْنُ سُفْيَانَ ثنا عَمْرُو بْنُ مَرْزُوقٍ أنبأ شُعْبَةُ عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ عَنْ حَفْصِ بْنِ عَاصِمٍ عَنِ ابْنِ بُحَيْنَةَ قَالَ

أَبْصَرَ رَسُولُ اللهِ ﷺ رَجُلًا يُصَلِّي رَكْعَتَيْنِ وَقَدْ أُقِيمَتِ الصَّلَاةُ فَقَالَ رَسُولُ اللهِ ﷺ الصُّبْحُ أَرْبَعًا الصُّبْحُ أَرْبَعًا؟ قَالَ يَعْقُوبُ الصَّحِيحُ هَذَا وَإِبْرَاهِيمُ قَدْ أَخْطَأَ فِي قَوْلِهِ عَنْ أَبِيهِ