Hadith Al Bukhari 2990 (en en2) The Coran abroad (3) Mohamed forbade to travel to a hostile country carrying copies of the Qur'an.
Allah's Messenger (ﷺ) forbade the people to travel to a hostile country carrying (copies of) the Qur'an. - Hadith Al Bukhari 2990 (islam)
Book 56, Hadith 199
Vol. 4, Book 52, Hadith 233
Hadith Muslim 1869a (en en2) The Messenger of Allah (ﷺ) forbade that one should travel to the land of the enemy taking the Qur'an with him. - Hadith Muslim 1869a (islam)
Book 33, Hadith 135
Book 20, Hadith 4607
Hadith Muslim 1869b (en en2) It has been narrated on the authority of Abdullah b. Umar that the Messenger of Allah (ﷺ) used to forbid that one should travel to the land of the enemy taking the Qur'an (with him) lest it should fall into the hands of the enemy. - Hadith Muslim 1869b (islam)
Book 33, Hadith 136
Book 20, Hadith 4608