Prophet Muhammad (Peace be upon him) said: "This world (i.e. its pleasures and duration) in comparison with the Life in the Hereafter is (similar to the amount of water) one gets when he puts his finger in the sea. Let him then see what it returns with.”
Al-Mustaurad bin Shaddad (r.a) reported the above Hadith. Sahih Muslim Hadith 463. Book 1 Chapter 55 Excellence of Ascetic life from Riyad-us-Saliheen page no. 423
Commentary by Hafiz Salahuddin Yusuf
This Hadith shows the value of the Hereafter and its blessings compared to the worldly life. The proportion between the two is that the former is like an ocean while the latter is like the proportion of water left on one’s finger when dipped in the sea.