The 82-year-old was speaking at the 29th annual Arab League summit in the oil-rich Saudi city of Dhahran.
He also announced a $150m (£105m) donation for the maintenance of Islamic heritage in East Jerusalem, including the Al Aqsa mosque, and $50m (£35m) in funding for the United Nations agency that provides aid to Palestinian refugees.
King Salman said the Palestinian issue will continue being the most important issue to the Arab World, until all Palestinians have attained their legal rights, including the establishment of a Palestinian independent state with Jerusalem as its capital.
Al-Jubeir had lambasted USA decision to move its embassy in Israel to Jerusalem town saying the move will hamper the global efforts to end Arab-Israel conflict in Middle East.
The last Arab summit was held in Jordan past year.
Topping the list of issues to be discussed are the Palestinian issue and financial support for Palestine, the crisis in Yemen, the Syrian conflict and Iran's interference in the internal affairs of the Arab states, among others.
They will also condemn Iran's interference in the affairs of the Arab states as a stark violation to the global law and will urge Tehran to stop all provocative acts that undermine trust-building efforts and threaten regional stability and security, especially after Iran-backed Houthis escalated firing missiles against Saudi Arabia.
Saudi Foreign Minister Adel al-Jubeir said on Thursday that Qatar's crisis would not be on the table at the Arab League summit, Al Arabiya reported.
During the summit, Saudi King Salman bin Abdulaziz criticized Tehran's influence on Arab countries, claiming that it violated the principles of worldwide law.
"We state decisively about our harsh condemnation of the use of chemical weapons against the friendly Syrian nation and demand to hold an independent worldwide probe and to implement global law in regards to those, whose responsibility for the use of chemical weapons will be proven", the final statement reads.
Most of the 22 other countries sent heads of state or government.
Riyadh expressed its support for the strikes on Damascus in a statement on Saturday.
There was little mention of Syria, whose president Bashar al Assad was not invited to the summit.
The summit was the first since a major diplomatic dispute between Qatar and some its Gulf neighbours.
Saudi Arabia's King Salman on Sunday opened an Arab League summit by criticising US President Donald Trump's decision to transfer the US embassy in Israel from Tel Aviv to Jerusalem. Doha denies the charges and says the boycott is an attempt to impinge on its sovereignty.
"The Saudis are going to push for a much harsher stance on Iran-not necessarily on the nuclear dossier per se, but on Iranian influence in the Arab countries, particularly Iraq, Syria, Lebanon and Yemen", said Karim Bitar of the Paris-based Institute of worldwide and Strategic Affairs.
Despite widespread Arab condemnation of the suspected chemical attack, the Dhahran summit is unlikely to call for Assad to step down.