Do Muslims worship the Kaaba or the Black Stone?

وَإِذْ جَعَلْنَا ٱلْبَيْتَ مَثَابَةًۭ لِّلنَّاسِ وَأَمْنًۭا وَٱتَّخِذُوا۟ مِن مَّقَامِ إِبْرَٰهِۦمَ مُصَلًّۭى ۖ وَعَهِدْنَآ إِلَىٰٓ إِبْرَٰهِۦمَ وَإِسْمَٰعِيلَ أَن طَهِّرَا بَيْتِىَ لِلطَّآئِفِينَ وَٱلْعَٰكِفِينَ وَٱلرُّكَّعِ ٱلسُّجُودِ ﴿١٢٥﴾

And when We made the House (at Makka) a resort for mankind and sanctuary, (saying): Take as your place of worship the place where Abraham stood (to pray). And We imposed a duty upon Abraham and Ishmael, (saying): Purify My house for those who go around and those who meditate therein and those who bow down and prostrate themselves (in worship).

إِنَّ أَوَّلَ بَيْتٍۢ وُضِعَ لِلنَّاسِ لَلَّذِى بِبَكَّةَ مُبَارَكًۭا وَهُدًۭى لِّلْعَٰلَمِينَ ﴿٩٦﴾

Lo! the first Sanctuary appointed for mankind was that at Becca, a blessed place, a guidance to the peoples;

وَإِذْ بَوَّأْنَا لِإِبْرَٰهِيمَ مَكَانَ ٱلْبَيْتِ أَن لَّا تُشْرِكْ بِى شَيْـًۭٔا وَطَهِّرْ بَيْتِىَ لِلطَّآئِفِينَ وَٱلْقَآئِمِينَ وَٱلرُّكَّعِ ٱلسُّجُودِ ﴿٢٦﴾

And (remember) when We prepared for Abraham the place of the (holy) House, saying: Ascribe thou no thing as partner unto Me, and purify My House for those who make the round (thereof) and those who stand and those who bow and make prostration.