The clerics read out a two-page special sermon ahead of the weekly Friday prayers denouncing violence and extremism in the name of religion citing verses from the Holy Quran and sayings of the Prophet, officials said.
"Whoever kills a person unjustly, it is as though he has killed all mankind," it read, citing a verse from the Quran.
It quoted the Prophet as saying the killing of a human being is the biggest sin and urged parents to take good care of their children so they cannot be "brainwashed".
The move comes after the deadly attack in an upscale Dhaka cafe in which 20 hostages, including an Indian girl, were brutally hacked to death in Bangladesh's worst terror attack by suspected Islamist militants. A subsequent army-led security clampdown killed six militants next morning.
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The state-run Islamic Foundation earlier said it prepared and disseminated the special sermon in Arabic and Bangla to be read out alongside the routine Friday sermon.
On the Eid day, the terrorists tried to attack the country's biggest Eid congregation at northern Sholakia where they killed 2 policemen before one of the attackers was gunned down.
A high-level cabinet committee last week decided to enforce a vigil on sermons during Friday prayers in mosques so no provocative sermons were delivered inspiring extremism while the government issued a clarion call on imams and religious leaders to use their influence in uprooting militancy.