Hamza bin Laden, former Al-Qaeda leader Osama bin Laden’s son, called on the jihadis in Syria to unite to fight and pave the way for “liberating Palestine.” The audio message that stated “Jerusalem is a bride whose blood is our dowry” was posted online around the same time Islamic State created a series of videos on usurping Jerusalem from Israel.

“The Islamic umma (nation) should focus on jihad in al-Sham (Syria) … and unite the ranks of mujahideen there,” said Hamza bin Laden in an audio message, as quoted by The Guardian. “There is no longer an excuse for those who insist on division and disputes now that the whole world has mobilised against Muslims.”

The message by Bin Laden’s son came after Al-Qaida’s leader, Ayman al-Zawahiri, called on the jihadis in Syria to unite inspite of his repeated rejection of the ISIS and its proclaimed caliphate.

“The matter of unity today is one of life and death,” Zawahiri said in an audio message posted online on Saturday according to US terrorist-tracking organisation SITE, a monitoring group. “Either you unite to live as Muslims with dignity, or you bicker and separate and so are eaten one by one.”

In the audio message, Zawahiri allegedly threw his support behind Al Qaeda-affiliated Al Nusra Front’s plans to establish a sovereign state in Syria. The state would be rivalled against Islamic State’s self-declared caliphate in the region, the NDTV reported.

“The liberation of Palestinian land has been brought much closer to the Syrian revolution,” said the audio message which Rita Katz, director of SITE, claimed was recorded about five months ago.

According to Osama bin Laden’s son, Syria will serve as the best battlefield to liberate Jerusalem. “The road to liberating Palestine is today much shorter compared to before the blessed Syrian revolution,” he said. As per US intelligence officials, Hamza was the favourite son of the former Al-Qaeda leader and had trained him to become the leader of the organisation in the future.