‘Ubada b. as-Samit said that when God’s messenger followed a bier he did not sit down till the corpse was placed in the side of the grave. On being accosted by a learned Jew and told that that was how they did, God’s messenger sat down and said, “Act differently from them.” Tirmidhi, Abu Dawud and Ibn Majah transmitted it, Tirmidhi saying that this is a gharib tradition and that Bishr b. Rafi' the transmitter was not strong.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عُبَادَةَ بْنِ الصَّامِتِ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا تَبِعَ جَنَازَةً لَمْ يَقْعُدْ حَتَّى تُوضَعَ فِي اللَّحْدِ فَعَرَضَ لَهُ حَبْرٌ مِنَ الْيَهُودِ فَقَالَ لَهُ: إِنَّا هَكَذَا نضع يَا مُحَمَّدُ قَالَ: فَجَلَسَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَقَالَ: «خَالِفُوهُمْ» . رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَابْنُ مَاجَهْ وَقَالَ التِّرْمِذِيُّ: هَذَا حَدِيثٌ غَرِيبٌ وَبِشْرُ بْنُ رَافِعٍ الرَّاوِي لَيْسَ بِالْقَوِيّ
sunnah.com