Khartoum Resolution

The Khartoum Resolution of 1 September 1967 was issued at the conclusion of the 1967 Arab League summit, which was convened in the wake of the Six-Day War in Khartoum, the capital of Sudan. The resolution is famous for containing (in the third paragraph) what became known as the "Three Nos": "no peace with Israel, no recognition of Israel, no negotiations with it..."
Interpretations.
Commentators have frequently presented the resolution as an example of Arab rejectionism. Efraim Halevy, Guy Ben-Porat, Steven R. David, Julius Stone, and Ian Bremmer all agree the Khartoum Resolution amounted to a rejection of Israel's right to exist. The Palestine Liberation Organization (PLO) itself enlisted the Khartoum Resolution to advocate against acceptance of Israel's right to exist as articulated in United Nations Security Council Resolution 242. Benny Morris wrote that the Arab leaders "hammered out a defiant, rejectionist platform that was to bedevil all peace moves in the region for a decade" despite an Israeli offer on June 19, 1967 "to give up Sinai and the Golan in exchange for peace." Odd Bull of the UNTSO opined in much the same manner in 1976.
Avi Shlaim has argued that Arab spokesmen interpreted the Khartoum declarations to mean "no formal peace "treaty", but not a rejection of peace; no "direct" negotiations, but not a refusal to talk through third parties; and no "de jure" recognition of Israel, but acceptance of its existence as a state" (emphasis in original). Shlaim states that the conference marked a turning point in Arab-Israeli relations by noting that Nasser urged Hussein to seek a "comprehensive settlement" with Israel. Shlaim acknowledges that none of that was then known in Israel, whose leaders took the "Three Nos" at face value. Fred Khouri argued that "the Khartoum conference cleared the way for the Arab moderates to seek a political solution and to offer, in exchange for their conquered lands, important concessions short of actually recognizing Israel and negotiating formal peace treaties with her.”
In the event, indirect negotiations between Israel, Jordan and Egypt eventually opened through the auspices of the Jarring Mission (1967–1973), and secret direct talks also took place between Israel and Jordan, but neither avenue succeeded in achieving a meaningful settlement, which set the stage for a new round of conflict.