Narrated Ubayy bin Ka'b:
"I asked the Messenger of Allah (ﷺ) about the saying of Allah, Most High: 'And We sent him to a hundred thousand, or even more (37:147). He said: 'Twenty thousand (more).'" (ID)
English reference (ID): Vol. 5, Book 44, Hadith 3229 (ID)
Arabic reference (ID): Book 47, Hadith 3536 (ID)