As-Salaam alaikum,
In ayat 4 of Surat Ahzab of the Holy Qur'an (33:4), Allah Ta'ala says:--

"Allah has not made for any man two hearts
inside his breast chamber."

-That is to say, there is only one heart in every man's breast chamber, either it can be occupied by Allah or the world and worldly relations, as Allah has no partners. While bowing and prostrating before Allah Ta'ala, therefore, we must concentrate on Him alone and renounce the world as love of the world and its allurements are the root cause of sins.