It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that Sayyiduna Ibn Mas'ud and Sayyiduna Ubayy bin Ka'b (may Allah be pleased with them both) disagreed about a man who prays. Sayyiduna Ubayy (may Allah be pleased with him) said: "He may pray in a single garment," while Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said: "(It is necessary that) he prays in two garments." When this reached the Commander of the Believers, Sayyiduna Umar (may Allah be pleased with him), he sent for them both and said: "Two eminent figures among the Companions of the Messenger of Allah (peace and blessings be upon him) have disagreed in the verdict on a single issue; now according to which of the two sayings should people act?" Then he himself gave the ruling, saying: "Take note! The correct view is what Sayyiduna Ubayy (may Allah be pleased with him) said, and Sayyiduna Ibn Mas'ud (may Allah be pleased with him) also spared no effort (in this ijtihad)."
Sahih mawquf (authentic, the saying of a Companion).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب العلم / 3027
Hadith Gradingمحدثین:إسناده صحيح، موقوف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: صَحِيحٌ مَوْقُوفٌ . » «أخرجه صحيح ابن خزيمة برقم: 760، وأخرجه السنن الكبرى للبيهقي برقم: 3336، وأخرجه مسند أحمد برقم: 21668، وأخرجه المطالب العالية لابن حجر برقم: 333، وأخرجه مصنف عبد الرزاق برقم: 1384، وأخرجه مصنف ابن أبي شيبة برقم: 3196، وأخرجه المعجم الكبير للطبراني برقم: 9505»