Sayyiduna Hudhayfah (may Allah be pleased with him) narrates that when the Prophet (peace and blessings of Allah be upon him) would wake up at night for Tahajjud, he would thoroughly clean his mouth with a miswak. These are the words of the hadith from Harun bin Ishaq. Abu Musa and Sa'id bin Abdur Rahman did not mention « للتھجّد » "for Tahajjud".