Sunan an-Nasa'i 1623
سنن النسائي#1623SahihIt was narrated that Hudhaifah said:"We were commanded to use the siwak when we got up to pray at night
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Isnaad
Al-AlbaniSahih Isnaad
Zubair Ali ZaiSahih
In-book reference: 20:26