Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:44:7 –

Lord of the heavens and the earth and that between them, if you would be certain.  

Lord of the heavens and the earth and all that is between them (read rabbu’l-samāwāti, in the nominative ˹to understand it˺ as a third predicate; or read rabbi’l-samāwāti as a substitution for rabbika, ‘your Lord’), if you should be certain, O people of Mecca, that God, exalted be He, is the Lord of the heavens and the earth, then also be certain that Muhammad (s) is His Messenger.
القرآن:٤٤:٧ –

رَبِّ السَّمَاوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا ۖ إِنْ كُنْتُمْ مُوقِنِينَ  

{رب السماوات والأرض وما بينهما} برفع رب خبر ثالث وبجره بدل من ربك {إن كنتم} يا أهل مكة {موقنين} بأنه تعالى رب السماوات والأرض فأيقنوا بأن محمداً رسوله.

See similar narrations below:

Collected by Qurʾān
quran:26:24 –

˹Moses˺ said, "The Lord of the heavens and earth and that between them, if you should be convinced."  

He said, ‘The Lord of the heavens and the earth and all that is between them, in other words, the Creator of ˹all˺ that — should you have conviction’, that He, exalted be He, is their Creator, then believe in Him alone.
القرآن:٢٦:٢٤ –

قَالَ رَبُّ السَّمَاوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا ۖ إِنْ كُنْتُمْ مُوقِنِينَ  

{قال ربُّ السماوات والأرض وما بينهما} أي خالق ذلك {إن كنتم موقنين} بأنه تعالى خالقه فآمنوا به وحده.
quran:38:66 –

Lord of the heavens and the earth and whatever is between them, the Exalted in Might, the Perpetual Forgiver."  

Lord of the heavens and the earth and all that is between them, the Mighty, Whose way ˹always˺ prevails, the ˹ever˺ Forgiving’, of His friends.
القرآن:٣٨:٦٦ –

رَبُّ السَّمَاوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا الْعَزِيزُ الْغَفَّارُ  

{رب السماوات والأرض وما بينهما العزيز} الغالب على أمره {الغفار} لأوليائه.
quran:37:5 –

Lord of the heavens and the earth and that between them and Lord of the sunrises.  

Lord of the heavens and the earth and all that is between them, and Lord of the sun’s risings, that is, as well as the sun’s settings — each day it ˹the sun˺ has a rising and a setting.
القرآن:٣٧:٥ –

رَبُّ السَّمَاوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا وَرَبُّ الْمَشَارِقِ  

{ربُّ السماوات والأرض وما بينهما وربُّ المشارق} أي والمغارب للشمس، لها كل يوم مشرق ومغرب.