[Abu 'Eisa said:] This Hadith is Hasan Sahih. It has been reported through other routes from the Prophet (ﷺ).
In-book : Book 22, Hadith 39
English translation : Vol. 3, Book 20, Hadith 1656
22. The Book on Virtues of Jihad
باب مَا جَاءَ فِي الْمَضْمَضَةِ وَالاِسْتِنْشَاقِ