God says
O you who have attained to faith, do not be false to God and the Apostle, and do not knowingly be false to the trust [amanah] that has been reposed to you; and know that your worldly goods and your children are but a trial and a temptation, and that with God there is a tremendous reward.* -- Q.8: 27
* Inasmuch as love of worldly goods and a desire to protect one’s family may lead a person to transgression, they are described as fitnah. However, contrary to the New Testament, the Qur’an does not postulate a contempt for worldly attachments as a pre-requisite of righteousness: it only demands man that he should not allow these attachments to deflect him from the pursuit of moral verities.
And never concern thyself with anything of which thou hast no knowledge:* verily, [thy] hearing and sight and heart – all of them – will be called to account for it [on Judgment Day]! -- Q.17:36*
This would seem to relate to groundless assertions about events or people (and hence to slander or false testimony), to statements based on guesswork unsupported by evidence, or to interfering in social situations which one is unable to evaluate correctly.
Prophet said
1. “Should I not inform you about the greatest of great sins? (These are:) setting up a partner with God, disobedience to parents and false talk”-- H: Bukhari and Muslim. N: Abu Bakrah.
2. “Beware of falsehood because falsehood leads to transgression and transgression leads to fire. A man continues to speak falsehood and (thus) to adhere to falsehood till he is enrolled as a great liar in the sight of God.”-- H: Bukhari and Muslim. N: Abdullah-b-Masud.
