Hadith: Say: La ilāha illallāhu wahdahu la sharīka lah, Allāhu akbar kabīra, wa al-hamdulillāhi kathīra, subhānallāhi Rabbi al-‘ālamīn, la hawla wa la quwwata illa billāhi al-‘azīz al-hakīm (There is no god but Allah, alone with no partner. Allah is the Greatest with all greatness, and abundant praise is due to Allah. Allah, the Lord of the worlds, is exalted above imperfection. There is no might nor power except with Allah, the Mighty and the All-Wise)

عَنْ سَعْدٍ رضي الله عنها قَالَ:
جَاءَ أَعْرَابِيٌّ إِلَى رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، فَقَالَ: عَلِّمْنِي كَلَامًا أَقُولُهُ، قَالَ: «قُلْ: لَا إِلَهَ إِلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ، اللهُ أَكْبَرُ كَبِيرًا، وَالْحَمْدُ لِلَّهِ كَثِيرًا، سُبْحَانَ اللهِ رَبِّ الْعَالَمِينَ، لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللهِ الْعَزِيزِ الْحَكِيمِ» قَالَ: فَهَؤُلَاءِ لِرَبِّي، فَمَا لِي؟ قَالَ: «قُلْ: اللهُمَّ اغْفِرْ لِي وَارْحَمْنِي وَاهْدِنِي وَارْزُقْنِي».
[صحيح] - [رواه مسلم] - [صحيح مسلم: 2696]

Sa‘d (may Allah be pleased with him) reported:
A Bedouin came to the Messenger of Allah (may Allah's peace and blessings be upon him) and said: Teach me words to say. He said: "Say: La ilāha illallāhu wahdahu la sharīka lah, Allāhu akbar kabīra, wa al-hamdulillāhi kathīra, subhānallāhi Rabbi al-‘ālamīn, la hawla wa la quwwata illa billāhi al-‘azīz al-hakīm (There is no god but Allah, alone with no partner. Allah is the Greatest with all greatness, and abundant praise is due to Allah. Allah, the Lord of the worlds, is exalted above imperfection. There is no might nor power except with Allah, the Mighty and the All-Wise)." The Bedouin said: Those words are for my Lord. But what is for me? Thereupon, he said: "Say: Allāhumma ighfirli, warhamni, wahdini, warzuqni. (O Allah, forgive me, have mercy upon me, guide me, and give me provision)."
[Authentic hadith] - [Narrated by Muslim] - [Sahih Muslim - 2696]

Explanation

A man from the Bedouin asked the Messenger of Allah (may Allah's peace and blessings be upon him) to teach him a Dhikr (remembrance of Allah) to say. So, the Prophet (may Allah's peace and blessings be upon him) said to him: Say: "There is no god but Allah, alone with no partner," starting with the testimony of monotheism, which means that no deity is truly worthy of worship except Allah. "Allah is the Greatest with all greatness," i.e., Allah is greater and more magnificent than everything. "And abundant praise is due to Allah," i.e., abundant praise is due to Allah for His attributes, acts, and countless favors. "Allah, the Lord of the worlds, is exalted above imperfection," i.e., He is exalted and far above deficiency. "There is no might nor power except with Allah, the Mighty and the All-Wise," i.e., there is no change from one state to another except through Allah, His assistance and guidance. The man said: Those words are for my Lord to remember and extoll Him, what supplication should I say for myself? So, the Prophet (may Allah's peace and blessings be upon him) said to him: Say: "O Allah forgive me" by erasing and concealing my sins. "And have mercy upon me" by conveying religious and worldly interests and benefits to me. "And guide me" to the best of states and to the straight path. "And give me provision" represented in lawful gains, health, and every kind of goodness and well-being.