Abu Hurairah (May Allah be pleased with him) reported:
A man said: "O Messenger of Allah (ﷺ), I intend to set out on a journey, so counsel me." He (ﷺ) said, "Fear Allah, and ascending towards the raised ground, you should recite: "Allahu Akbar (Allah is Greatest)." When the man turned away, he (ﷺ) said, "O Allah! Shorten the distance for him and make the journey easy for him."[At-Tirmidhi].
App reference: Book 8, Hadith 23
Arabic/English book reference: Book 8, Hadith 978