فكأنهso he is like فيin الماءthe water صاحبُa follower of مذهبٍa school of thought
فكأنه في الماء صاحبُ مذهبٍ
أغراهenticed him وِسواسٌobsessive doubt بأنinto believing that لمhas not يطهُرِbecome pure
أغراه وِسواسٌ بأن لم يطهُرِ
So, in the water, he is like a follower of a school of thought,
As if in water, a companion of doctrine
Whom obsessive doubt has led to believe that he has not become pure.
Tempted by obsession that he is not purified
Sol 6.1