On whom is the call to Allah obligatory?

Question:
May Allah reward you with good. The questioner says in his question: Is the call to Allah obligatory upon every Muslim, or only upon some people?

Answer:
The call to Allah is obligatory upon the one who is able to call and has the qualification for it, because he must have knowledge of what he is calling to, and he must have wisdom in calling to Allah the Exalted. Allah the Exalted said: He must have patience and the ability to bear hardship, and as we mentioned, he must also have the intention of seeking reward and a good intention, meaning he must be free from the love of fame and the love of praise from people, and his aim must be only the Face of Allah the Exalted. For Allah, Glorified and Exalted is He, says, "And call to the way of your Lord," and the Prophet (peace and blessings be upon him) said, "Call to Allah." So the Muslim calls to Allah, not to himself, and if he seeks from that fame and praise from people, then that nullifies the work, whether it is the call or otherwise. If these conditions are present in him: first, knowledge of what he is calling to; second, wisdom in placing matters in their proper places; third, gradualness in the call, starting with the important, then starting with the most important, then the important, and he progresses in that; then patience, seeking reward, gentleness, and not despairing—all of these are the characteristics of the Muslim caller. As for the one in whom these conditions are not present, he does not fall under the subject of the call, but he should love it and love its people, and desire this work, love it and love its people, and wish to perform it if he could. He is rewarded for his intention and his aim. Yes.