that Allah's Apostle (p.b.u.h) said, Whoever attends the funeral ...

Hadith 2:410

Narrated Abu Huraira:

that Allah's Apostle (p.b.u.h) said, "Whoever attends the funeral procession till he offers the funeral prayer for it, will get a reward equal to one Qirat, and whoever accompanies it till burial, will get a reward equal to two Qirats." It was asked, "What are two Qirats?" He replied, "Like two huge mountains."