April Fool' Great Prohibition In Islam

In this regard the eminent scholar Sheikh Yusuf Al-Qaradawi states:

Telling lies is bad conduct. It is not proper for righteous people and true believers; rather, it is a sign of hypocrisy, as the Prophet (peace and blessings be upon him) said, "The hypocrite has three characteristics: he tells lies, breaks his promise, and breaches the trust" (Al-Bukhari and Muslim).
Consequently, lying is forbidden in any form, and on this occasion (April Fools' Day) it is forbidden for four reasons:

1. The prohibition of lying which is confirmed by the Qur'an and the Sunnah,

2. The unwarranted grief or fear it may bring on a person or his entire family, even if only for one hour,

3. The betrayal of trust it entails,

4. The emulation of a silly custom that is not ours, that of lying.

Sometimes the idea of telling a lie on this day may be obnoxious to the whole society, not only to a person.