The Quran

أَلا لِلَّهِ الدّينُ الخالِصُ ۚ وَالَّذينَ اتَّخَذوا مِن دونِهِ أَولِياءَ ما نَعبُدُهُم إِلّا لِيُقَرِّبونا إِلَى اللَّهِ زُلفىٰ إِنَّ اللَّهَ يَحكُمُ بَينَهُم في ما هُم فيهِ يَختَلِفونَ ۗ إِنَّ اللَّهَ لا يَهدي مَن هُوَ كاذِبٌ كَفّارٌ

(Saheeh International)

Unquestionably, for Allāh is the pure religion.¹ And those who take protectors besides Him [say], "We only worship them that they may bring us nearer to Allāh in position." Indeed, Allāh will judge between them concerning that over which they differ. Indeed, Allāh does not guide he who is a liar and [confirmed] disbeliever.

i.e., acceptable to Allāh is that none be associated with Him in worship and obedience.