You say: Oh you disbelievers!
Disbelievers are those who hide and reject Adhikr- Adhikr. During Prophet’s time the disbelievers were his people who were literates. Whereas he and most of his companions were illiterates. But today, the disbelievers are those who hide Adhikr knowingly and who reject It blindly after receiving It. The verse 2: 39 says: ”And those who hide and reject with Our verses, such are the inmates of the fire; they shall remain in it forever”. This verse commands the believer to identify disbelievers among the people by utilizing the Criterion-Adhikr- and address them as ‘Kafir’. The disbelievers mentioned in the verse 2:6 are the hypocrites who will enter the Hell without Trial, while the disbelievers mentioned in the verse 39:71 are the blind followers who will be driven to Hell after Trial. Read together 4: 140 and 33: 1, 48. To any of them, at the time of their death Lord will tell that they were among disbelievers as mentioned in the verse 39:59. See the explanation 9: 73; 39: 7-8 and 41: 26-29.