Abu Huraira reported: Prophet
said, “People are like mines of silver and gold” (Muslim) Each human being is like a mine of gold. He is akin to ‘reservoir of gold’. If you hold good opinion, then his good will be revealed to you. There will be affection, love. Due to the devil, you hold onto ill thoughts then there will separation (disunity will be created).
First consequence of suspecting someone, there will no longer be any ‘co-operation’. One’s mind ceases to see any good in that individual, one stops caring. Because he suspects. And (sometimes) there is no proof for merely suspecting someone. One’s perspective has changed, only their bad characteristics emphasized. First thoughts of suspicion will appear in one’s mind. Then it will come on one’s tongue. When it comes on one’s tongue, it becomes backbiting.
Scholar Yusuf رحمة الله عليه used to say the sin of backbiting, its immediate punishment is the hearts will not be united. Holding onto ill suspicion they will say this person did this and that. And that person is innocent he has no idea (what is being said about him). This is why Allah has forbidden this.
Save yourself from suspecting others. In Muslim society, one should avoid suspicion. If you see someone’s fault, hide it. Read the stories of Companions of Prophet
. In society, don’t’ expose others and keep talking about it.
Prophet
said “Whoever conceals [the faults of] a Muslim, Allah will conceal [his faults] in this life and the Hereafter.” (Muslim)
Companions of Prophet
would emphasize on this ie to hide faults. Umar (rad) said ‘if something bad appears in society, then don’t propagate it’. So it gets buried (doesn’t spread), don’t bring it to your lips. If you keep talking about it, then those who didn’t know about it will come to know of it and environment will get ruined. These are effects of having (wrongful) suspicion. 
