It is narrated from Rashid bin Yasar (may Allah have mercy on him) that he said: "I bear (sworn) witness about five eminent Companions of the Prophet (peace and blessings be upon him) (may Allah be pleased with them), who attained the great honour of pledging allegiance beneath the tree (the Pledge of Ridwan), as described in 'Certainly Allah was pleased with the believers when they pledged allegiance to you beneath the tree' [Surah al-Fath: 18], that they used to pray two (voluntary) rak'ahs before the obligatory Maghrib prayer began."
Imam Ibn Abi Shaybah recorded this narration in "al-Musannaf" (hadith: 7468), and all its narrators are thiqat (trustworthy), on the basis of which this narration is of hasan (good) grade.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب النوافل / 622
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف. » «أخرجه البيهقي فى«سننه الكبير» برقم: 4575، وأورده ابن حجر فى "المطالب العالية"، 622»