Nothing more beneficial and harmful to the heart than…
Shaykhul Islaam Ahmad ibn Taymeeyah 728AH (May Allah have mercy on him) said, ولا أنفع للقلب من التوحيد وإخلاص الدين لله ، ولا أضرَّ عليه من الإشراك. مجموع الفتاوى [٦٥٢/١٠] “There is nothing more beneficial for the heart than Tawheed and sincerity in the religion for Allah, and there is nothing more harmful for the…