I heard the Messenger of Allah ﷺ say, "The likeness of this world compared to the Hereafter is nothing but as if one of you were to dip his finger into the sea. Let him see what comes back on it."
حدثنا محمد بن عبد الله بن نمير حدثنا أبي ومحمد بن بشر قالا حدثنا إسمعيل بن أبي خالد عن قيس بن أبي حازم قال سمعت
سمعت رسول الله ﷺ يقول ما مثل الدنيا في الآخرة إلا مثل ما يجعل أحدكم إصبعه في اليم فلينظر بم يرجع
Muslim narrated it in Paradise and Its Bliss, chapter, The Passing Away of This World and the Description of the Gathering on the Day of Resurrection, hadith 55/2858, from Ibn Numayr, via this route.