The grand assembly is meeting in Kabul this week to discuss peace and called for an immediate ceasefire between the government and militants.
President Ashraf Ghani agreed to a truce provided it was not “one-sided”.
But the Taliban rejected the call and accused members of being government allies.
In 2018 the Taliban agreed a three-day ceasefire coinciding with Eid at the end of the holy month of Ramadan – their first since the 2001 US-led invasion.
Speaking at the meeting of the loya jirga – a grand tribal council attended by 3,200 religious leaders, politicians and representatives from across the country – Mr Ghani said: “Let us prove that only Western countries cannot solve this conflict. There is also human civilisation here.”