Ammar bin Abi Ammar reported that When Saydna Zaid bin Thabit رضیﷲ عنه died, then Saydna Abdullah ibn Abbas رضیﷲ عنه said:
هكذا ذهاب العلم، لقد دفن اليوم علم كثير
This is how (علم) knowledge will be taken away. today a huge amount of knowledge got buried with Zaid ibn Thabit.
With each death of a scholar, knowledge gets vanished and taken away.
[Al Maarifa wa Tarikh lil Safawi 1/261, Ibn Saad 2/117]
Via Shaikh Nadeem Zaheer