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
tabarani:9346 – Isḥāq b. Ibrāhīm > ʿAbd al-Razzāq > al-Thawrī > a man > al-Minhāl b. ʿAmr > Abū ʿUbaydah > Mar Ibn Masʿūd Birajul Ṣāf Bayn Qadamayh

[Machine] As for this, it would be a mistake to choose either one, as being in-between them would be more preferable to me.  

الطبراني:٩٣٤٦ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ عَنْ عَبْدِ الرَّزَّاقِ عَنِ الثَّوْرِيِّ عَنْ رَجُلٍ عَنِ الْمِنْهَالِ بْنِ عَمْرٍو عَنْ أَبِي عُبَيْدَةَ قَالَ مَرَّ ابْنُ مَسْعُودٍ بِرَجُلٍ صَافَّ بَيْنَ قَدَمَيْهِ فَقَالَ

«أَمَّا هَذَا فَقَدْ أَخْطَأَ السُّنَّةَ لَوْ رَاوَحَ بَيْنَهُمَا كَانَ أَحَبَّ إِلَيَّ»  

See similar narrations below:

Collected by Nasāʾī, Suyūṭī
nasai:893 – Ismāʿīl b. Masʿūd > Khālid > Shuʿbah > Maysarah b. Ḥabīb > al-Minhāl b. ʿAmr > Abū ʿUbaydah > ʿAbdullāh > Raʾá a man Yuṣallī Qad Ṣaf Bayn Qadamayh

He saw a man praying with his feet together. He said: "He is not following the Sunnah. If he were to shift his weight from one to the other I would like that better."  

النسائي:٨٩٣ – أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ قَالَ حَدَّثَنَا خَالِدٌ عَنْ شُعْبَةَ قَالَ أَخْبَرَنِي مَيْسَرَةُ بْنُ حَبِيبٍ قَالَ سَمِعْتُ الْمِنْهَالَ بْنَ عَمْرٍو يُحَدِّثُ عَنْ أَبِي عُبَيْدَةَ عَنْ عَبْدِ اللَّهِ

أَنَّهُ رَأَى رَجُلاً يُصَلِّي قَدْ صَفَّ بَيْنَ قَدَمَيْهِ فَقَالَ أَخْطَأَ السُّنَّةَ وَلَوْ رَاوَحَ بَيْنَهُمَا كَانَ أَعْجَبَ إِلَىَّ  

suyuti:430-449b –
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السيوطي:٤٣٠-٤٤٩b –

"مرَّ ابْن مَسْعُودٍ بَرجُلٍ صَافٍّ بَيْنَ قَدَمَيْهِ فَقَالَ: أمَّا هَذَا فَقَدْ أَخْطأَ السُّنَّةَ، لَوْ رَاوَحَ بَيْنَهُمَا كَانَ أَحَبَّ إِلَىَّ".  

[عب] عبد الرازق عن أبي عبيدة
suyuti:430-157b – Biá ʿUbaydh > Mar Ibn Masʿūd Birjul Ṣāf Bayn Qadamayh
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السيوطي:٤٣٠-١٥٧b –

"عَنْ أبِى عُبَيْدةَ قَال: مَرَّ ابنُ مَسْعُودٍ بِرجُلٍ صَافٍّ بَيْنَ قَدَمَيْهِ فَقَالَ: أَمَّا هَذَا فَقَدْ أخْطأ السُّنَةَ لَو رَاوَحَ بَيْنَهُمَا كَانَ أحبَّ إلىَّ".  

[عب] عبد الرازق