"I heard Al-Bara' bin 'Azib say: The Messenger of Allah said: 'whoever follows a Janazah until the prayer is offered, he will have one Qirat of reward and whoever walks with the funeral until (the body) is buried will have two Qirats of reward, and a Qirat is like Uhud."'  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ تَبِعَ جَنَازَةً حَتَّى يُصَلَّى عَلَيْهَا كَانَ لَهُ مِنَ الأَجْرِ قِيرَاطٌ وَمَنْ مَشَى مَعَ الْجَنَازَةِ حَتَّى تُدْفَنَ كَانَ لَهُ مِنَ الأَجْرِ قِيرَاطَانِ وَالْقِيرَاطُ مِثْلُ أُحُدٍ  

"The Messenger of Allah said: 'Whoever follows a Janazah until it is finished, he will have two Qirats, and whoever goes back before it is finished, he will have one Qirat."  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ تَبِعَ جَنَازَةً حَتَّى يُفْرَغَ مِنْهَا فَلَهُ قِيرَاطَانِ فَإِنْ رَجَعَ قَبْلَ أَنْ يُفْرَغَ مِنْهَا فَلَهُ قِيرَاطٌ