Some callers display signs of sins; does this prevent benefiting from them, their knowledge, and their da'wah?

Question:
This question asks for your opinion regarding those who call to Allah and appear sincere in this work of theirs, but they have some manifestations of violations and sins. Does this prevent benefiting from them, their knowledge, and their da'wah?

Answer:
It is not a condition for the one who calls to Allah or the teacher that he be perfect. One should benefit from the student of knowledge, the teacher, and the one who calls to Allah, even if he has a deficiency in his character and deeds. However, this does not prevent advising him and guiding him to good with kind words and a good manner. For example, if he is lazy about praying in congregation, he is advised. If he lets his garments hang below his ankles, he is advised. It is emphasized that the Prophet (peace and blessings be upon him) said and prohibited letting garments hang below the ankles, and he condemned those who do so. He said, "Beware of letting garments hang below the ankles, for it is part of arrogance." So, if he shaves his beard and cuts it, it is explained to him, and he is advised and told: The Prophet (peace and blessings be upon him) said, "Trim the mustaches and let the beards grow. Trim the mustaches and let the beards grow. Differ from the polytheists. Differ from the Magians. Trim the mustaches and let the beards grow." They said, "The polytheists," and there are authentic hadiths from the Messenger of Allah (peace and blessings be upon him) to this effect. Likewise, if he is lazy about other good deeds, or does not care about studying, or the like, this does not prevent taking benefit from him along with advising him. The bottom line is that a scholar may have a deficiency; he may be lax in some matters, whether he is a teacher, a caller to Allah the Exalted, a judge, or otherwise.
So, who is there whose traits you are entirely pleased with? In this, there should be private, gentle, and kind advice so that the objective is achieved, so that good increases and evil decreases. This is what is required of the believers among themselves: mutual advice. Religion is advice. Yes.