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When the Prophet (ﷺ) got up at night (for the night prayer), he used to clean his mouth .

Whenever the Messenger of Allah (ﷺ) got up for Tahajjud prayer, he cleansed his mouth with the tooth-stick.

for offering Tahajjud prayer.

Whenever he (the Prophet) got up for prayer during the night, he cleansed his mouth with the tooth-stick.

When the Messenger of Allaah (sal Allaahu alayhi wa sallam) got up during the night (to pray), he cleansed his mouth with the tooth-stick.

When the Prophet (ﷺ) got up to pray at night, he would brush his teeth with the siwak.

"When the Messenger of Allah (ﷺ) got up to pray tahajjud at night, he would brush his teeth with the siwak.

"Whenever the Messenger of Allah got up for prayer at night to pray Tahajjud (night optional prayer), he would clean his mouth with the tooth stick."

"The Messenger of Allah used to pray in the night (Qiyamul-Lail) two Rak'ah by two, then when he finished he would use the tooth stick."

Hudhaifa said that when the Prophet (ﷺ) got up to pray during the night he cleansed his mouth with the tooth-stick. (Bukhari and Muslim.)