Riyad as-Salihin Hadith 977

Whenever the Prophet (ﷺ) returned from Hajj or 'Umrah and ascended a height or hill, he would recite thrice: "Allahu Akbar (Allah is Greatest)." Then he would say, "La ilaha ill-allahu wahdahu la sharika lahu, lahul- mulku, wa lahul-hamdu, wa Huwa 'ala kulli shay'in Qadeer. Ayibuna ta'ibuna 'abiduna li-Rabbina hamidun. Sadaq-Allahu wa'dahu, wa nasara 'abdahu, wa hazamal-ahzaba wahdahu [None has the right to be worshipped but Allah, Who has no partner, to Whom the sovereignty belongs, to Whom all praise is due, and Who is Able to do all things. We are those who return (in safety), feel penitence, worship Allah, prostrate before our Rubb and praise Him. Allah has fulfilled His Promise, helped His slave (i.e., Muhammad (ﷺ)) and He Alone vanquished the Clans]." [Al-Bukhari and Muslim].