Halakhah zu Schemot 34:14

To not bow down to idolatry: To not bow down to idolatry - and idolatry is anything that is worshiped besides God, blessed be He - as it is stated (Exodus 20:5), "You shall not bow down to them or serve them." And the explanation of the verse is not "do not bow down to them with the intention of worship," [so] that we would learn that bowing down, by itself - without the intention of worship - would not be forbidden. As behold, in another place, it is stated in the Torah (Exodus 34:14), "For you must not bow down to another god," which forbade bowing down by itself, from any angle. Rather, [the reason] it made "or serve them" adjacent, [is] to say that bowing down is one of the ways of worship. And we learn from here, with the assistance of other verses, that there are four worships about which the Torah is insistent with any idolatry in the world - and even if it is not the way of its worship, we are liable for it. And one of [these four] is bowing down.