Musnad Ahmad 227
It was narrated frorn Abu Wa'il that a man who was a Christian and was known as as-Subayy bin Ma'bad became Muslim and wanted to go for jihad. It was said to him:
Start with Hajj. So he went to al-Ash'ari, who told him to enter ihram for Hajj and ‘Umrah together. So he did that, and whilst he was reciting the Talbiyah,Zaid bin Soohan and Salman bin Rabee'ah passed by him, and one of them said to the other. This one is more misguided than his family's camel. As-Subayy heard them and that upset him. When he arrived he went to 'Umar and told him about that, 'Umar رضي الله عنه   said to him: You have been guided to the Sunnah of your Prophet (ﷺ). He [the narrator] said: On another occasion I heard him say: You have been helped to follow the Sunnah of the Prophet.
حَدَّثَنَا هُشَيْمٌ، أَخْبَرَنِي سَيَّارٌ، عَنْ أَبِي وَائِلٍ، أَنَّ رَجُلًا، كَانَ نَصْرَانِيًّا يُقَالُ لَهُ الصُّبَيُّ بْنُ مَعْبَدٍ أَسْلَمَ فَأَرَادَ الْجِهَادَ فَقِيلَ لَهُ ابْدَأْ بِالْحَجِّ فَأَتَى الْأَشْعَرِيَّ فَأَمَرَهُ أَنْ يُهِلَّ بِالْحَجِّ وَالْعُمْرَةِ جَمِيعًا فَفَعَلَ فَبَيْنَمَا هُوَ يُلَبِّي إِذْ مَرَّ يَزِيدُ بْنُ صُوحَانَ وَسَلْمَانُ بْنُ رَبِيعَةَ فَقَالَ أَحَدُهُمَا لِصَاحِبِهِ لَهَذَا أَضَلُّ مِنْ بَعِيرِ أَهْلِهِ فَسَمِعَهَا الصُّبَيُّ فَكَبُرَ ذَلِكَ عَلَيْهِ فَلَمَّا قَدِمَ أَتَى عُمَرَ فَذَكَرَ ذَلِكَ لَهُ فَقَالَ لَهُ عُمَرُ رَضِيَ اللَّهُ عَنْهُ هُدِيتَ لِسُنَّةِ نَبِيِّكَ قَالَ وَسَمِعْتُهُ مَرَّةً أُخْرَى يَقُولُ وُفِّقْتَ لِسُنَّةِ نَبِيِّكَ‏.‏