Helping each other in the Da'wah - Shaykh al-Uthaymin

This is a lecture by Sheikh al-Uthaymin (may Allah have mercy on him) at the College of Usul al-Din in Riyadh, affiliated with Imam Muhammad ibn Saud Islamic University, in the year 1410 AH (1989/1990 CE). It discusses what preachers need in terms of cooperation, mentioning the characteristics of a preacher and the necessity of the preacher embodying what they call for, being insightful and patient, and not calling to themselves. It concludes with some of the etiquette of preachers, then answers to questions about the ruling on calling to Allah, the means of da'wah (invitation to Islam), the cooperation of preachers with media institutions, and other matters.