Ibn AAumar reported that the Messenger of Allah on return from a battle or from performing the pilgrimage would say at every high point:
Chapter
While returning from travel
4 entries
ا للهُ أَكْـبَر، ا للهُ أَكْـبَر، ا للهُ أَكْـبَر.
Allahu akbar, Allahu akbar, Allahu akbar.
Translation
Allah is the greatest, Allah is the greatest, Allah is the greatest.
When to recite
When returning from a journey.
…and then he would say:
لا إلهَ إلاّ اللّهُ وَحْـدَهُ لا شريكَ لهُ، لهُ الملكُ ولهُ الحَمْد، وهُوَ على كُلّ شَيءٍ قَـدير، آيِبـونَ تائِبـونَ عابِـدونَ لِرَبِّـنا حـامِـدون، صَدَقَ اللهُ وَعْـدَه، وَنَصَـرَ عَبْـدَه، وَهَزَمَ الأَحْـزابَ وَحْـدَه.
La ilaha illal-lahu wahdahu la shareeka lah, lahul-mulku walahul-hamd, wahuwa AAala kulli shay-in qadeer, ayiboona ta-iboon, AAabidoon, lirabbina hamidoon, sadaqal-lahu waAAdah, wanasara AAabdah, wahazamal-ahzaba wahdah.
Translation
None has the right to be worshipped except Allah, alone, without partner. To Him belongs all sovereignty and praise, and He is over all things omnipotent. We return, repent, worship and praise our Lord. Allah fulfilled His promise, aided His Servant, and single-handedly defeated the allies.
When to recite
When returning from a journey.