The Three Divine Attributes
رَبّ: المُرَبِّي والمالِكُ والسَّيِّد · مَلِك: المُتَصَرِّفُ بالأمرِ والنَّهْي · إلَٰه: المَعبودُ المُستَحِقُّ للعِبادَة
Rabb: the Nurturer, the Lord, the Owner who sustains and raises. Malik: the Sovereign King who commands and decrees. Ilāh: the one true God who alone deserves worship.
From Mufradāt al-Rāghib al-Aṣfahānī
الرَّبُّ: في الأصلِ التَّربِيةُ، وهو إنشاءُ الشَّيءِ حالًا فحالًا إلى حدِّ التَّمام. والمَلِكُ: المُتَصَرِّفُ بالأمرِ والنَّهْي في الجُمهور. والإلَٰهُ: المَعبودُ، وهو اللَّهُ سبحانه الذي تَأْلَهُه القُلوبُ أي تَعبُدُه وتَطمَئِنُّ إليه.
Al-Rabb: originally from tarbiyah (nurturing), which is bringing something from one state to the next until completion. Al-Malik: the one who commands and prohibits among the multitude. Al-Ilāh: the one worshipped; He is Allah, glorified, to whom the hearts turn in worship and in whom they find tranquility.
Why all three attributes?
The opening of Surah An-Nas invokes Allah by three names: Rabb (Lord), Malik (King), and Ilāh (God). The scholars explain this as a comprehensive appeal. The Rabb nurtures and protects, the Malik governs and decrees, and the Ilāh is the object of worship and ultimate devotion. Together, these three encompass every dimension of the relationship between the Creator and the created. No avenue for the whisperer remains when the servant places himself under the rubūbiyyah, mulk, and ulūhiyyah of Allah.
Ibn al-Qayyim noted that these three names ascend in specificity: Rabb is the most general (Lord of all things), Malik is more specific (Sovereign over mankind), and Ilāh is the most specific (the One worshipped by the heart). The seeker of refuge ascends through all three levels, leaving no gap for Shayṭān to exploit.