ENOfficial
‘Abdallah b. Mas'ud reported God’s messenger as saying, “The bier should be followed and should not follow. Those who go in front of it are not accompanying it." Tirmidhi, Abu Dawud and Ibn Majah transmitted it. Tirmidhi said that Abu Majid the transmitter is unknown.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْجَنَازَةُ مَتْبُوعَةٌ وَلَا تَتْبَعُ لَيْسَ مَعَهَا مَنْ تَقَدَّمَهَا» . رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَابْنُ مَاجَهْ وَقَالَ التِّرْمِذِيّ وَأَبُو ماجد الرَّاوِي رجل مَجْهُول
sunnah.com