﴿ وَإِذَا مَرُّوا۟ بِهِمْ يَتَغَامَزُونَ ﴾

“and whenever they pass by them, they wink at one another [derisively];”

(And wink one to another) they slander the believers (when they passed them) when the believers passed the disbelievers in their way to the Messenger of Allah (pbuh);