Rational Proof for Allah's Existence

فَلَمَّا رَءَا ٱلشَّمْسَ بَازِغَةً قَالَ هَـٰذَا رَبِّى هَـٰذَآ أَكْبَرُ ۖ فَلَمَّآ أَفَلَتْ قَالَ يَـٰقَوْمِ إِنِّى بَرِىٓءٌ مِّمَّا تُشْرِكُونَ

And when he saw the sun rising, he said, "This is my lord; this is greater." But when it set, he said, "O my people, indeed I am free from what you associate with Allāh.