Surah An-Naba 78:36

جَزَآءً مِّن رَّبِّكَ عَطَآءً حِسَابًا

[As] reward from your Lord, [a generous] gift [made due by] account,

Translation: Saheeh International

Tafsir

this will be a reward from your Lord in other words God has rewarded them with this reward as a gift ‘atā’an substitutes for jazā’an ‘reward’ that is sufficing that is abundant hisāban as meaning ‘abundant’ derives from their saying a‘tānī fa-ahsabanī ‘he gave me so abundantly that I said “that is enough for me”’ hasbī

Excerpt from Tafsir al-Jalalayn, commentary on 78:36, via Quran.com. The reader has the full commentary and 9 more tafsirs.