﴿ وَقُل لِّلَّذِينَ لَا يُؤْمِنُونَ ٱعْمَلُوا۟ عَلَىٰ مَكَانَتِكُمْ إِنَّا عَٰمِلُونَ ﴾

“And say unto those who will not believe: "Do anything that may be within your power, [while] we, behold, shall labour [in God's way];”

And say to those who do not believe ‘Act according to your ability according to your status we are acting according to our status — this is a threat for them.