Sin is a wound in the heart.........الإثم حزاز القلوب

 Meaning, it is what wounds and itches it, as it was said, sin is what itches in your heart, even if people give you a fatwa about it and give you a fatwa. And the wound is what moves in the heart of grief, and from it is the saying of Ibn Sirin when he was asked: What is the most severe form of piety? He said: How easy it is if you doubt something, then leave it.

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 Let your conscience be your guide.

A guilty conscience needs no accuser.

If it troubles your conscience, don't do it.

There is also an expression very close in meaning to the Prophetic tradition:

If in doubt, leave it out.

If doubt enters your mind, leave it. This is similar to Ibn Sirin's saying: "If you doubt something, leave it."

The closest English interpretation of the proverb is:

Sin is what troubles the heart and disturbs the conscience.

يعني، ما حز فيها وحكها أي أثر كما قيل الإثم ما حك في قلبك وإن أفتاك الناس عنه وأفتوك؛ والحزاز، ما يتحرك في القلب من الغم، ومنه قول ابن سيرين حين قيل له: ما أشد الورع? فقال، ما أيسره إذا شككت في شيء، فدعه.