Tafsir of Fatir 35:24

إنا أرسلناك بالحق بشيرا ونذيرا

Verily, We have sent you with the truth, a bearer of glad tidings and a warner. means, a bearer of glad tidings to the believers and a warner to the disbelievers.

وإن من أمة إﻻ خﻼإ فيها نذير

And there never was a nation but a warner had passed among them. means, there was never any nation among the sons of Adam but Allah sent warners to them, and left them with no excuse. This is like the Ayat:

إنما أنت منذر ولكل قوم هاد

You are only a warner, and to every people there is a guide. (13:7)

ولقد بعثنا فى كل أمة رسوﻻ أن اعبدوا الله واجتنبوا الطغوت فمنهم من هدى الله ومنهم من حقت عليه الضللة

And verily, We have sent among every Ummah a Messenger (proclaiming): "Worship Allah, and avoid all false deities.'' Then of them were some whom Allah guided and of them were some upon whom the straying was justified. (16:36) And there are many similar Ayat