﴿ أَتَبْنُونَ بِكُلِّ رِيعٍ ءَايَةًۭ تَعْبَثُونَ ﴾

““Will you, in your wanton folly, build [idola­trous] altars on every height,”

Do you build on every prominence every high place a monument an edifice as a signpost for passers-by so that you may hurl abuse? at those who pass by you and deride them ta‘bathūna is a circumstantial qualifier referring to the subject of the verb tabnūna ‘you build’.