Jami At Tirmidhi
2323
Sahih+3

Qa'is bin Abi Hazim said:I heard Mustawrid, a member of Banu Fihr, saying: The Messenger of Allah (s.a.w) said: "The world compared to the Hereafter is but like what one of you gets when placing his finger into the sea, so look at what you draw from it

SahihAhmad Muhammad Shakir
SahihAl-Albani