How should the da’wah (call) to Islam be?

One should be wary of the proclamation of Jaahiliyyah (times of ignorance before Islam), such as saying, "O people of so-and-so, O people of so-and-so." No! (Say) O people of Tawheed! O people of Imaan (belief)! They’re all brothers. If war comes, he doesn’t affiliate with and say, "O so-and-so, O Qahtaaniy (a tribe), O tribe so-and-so, O tribe so-and-so," no. They are one. The Muslims are one. One shouldn’t make proclamations of Jaahiliyyah. And for this reason, when (a man from the time of the Prophet ﷺ) called for help, "O Muhaajirin (migrants)!" and another (man) said, "O Ansaar (people of Madinah)!" The Prophet ﷺ said, "Do you make the proclamation of the times of Jaahiliyyah while I am amongst you?!" So, what’s obligatory is calling by Islam: "O brothers! O Muslims! O believers!" (It should be) like this when calling for help. He urges them to fight in the name of Islam and Imaan (faith).