It didn't start on October 7:

Haifa massacre - March 6, 1937⁣⁣
Jerusalem massacre - Dec 6, 1937⁣⁣
Haifa massacre - March 27, 1938⁣⁣
Haifa massacre - July 6, 1938⁣⁣
Jerusalem massacre - July 13, 1938⁣⁣
Jerusalem massacre - July 15, 1938⁣⁣
Haifa massacre - July 25, 1938⁣⁣
Jerusalem massacre - July 26, 1938⁣⁣
Balad al-Sheikh massacre - June 12, 1939⁣⁣
Haifa massacre - June 19, 1939⁣⁣
Haifa massacre - June 20, 1947⁣⁣
Jaffa massacre - Dec 12, 1947⁣⁣
Abbasiya massacre - Dec 13, 1947⁣⁣
Al-Khasas massacre - Dec 18, 1947⁣⁣
Bab al-Amud massacre - Dec 29,⁣⁣
1947⁣⁣
Jerusalem massacre - Dec 30,⁣⁣
1947⁣⁣
Balad al-Sheikh massacre - Dec 31, 1947⁣⁣
Deir Yassin massacre - April 9, 1948⁣⁣
Abu Shusha village massacre - May 9, 1948⁣⁣
Tantura massacre - May 22, 1948⁣⁣
Lydda massacre - July 1948⁣⁣
Qibya massacre - Oct 14, 1953⁣⁣
Al-Dawayima massacre - Oct 29, 1948⁣⁣
Kafr Qasem massacre - Oct 29, 1956⁣⁣
Khan Yunis massacre - Nov 3, 1956⁣⁣
Rafah massacre - Nov 12, 1956⁣⁣
Abu Zaabal factory bombing - Feb 13, 1970⁣⁣
Sabra and Shatila massacre - Sept 16, 1982⁣⁣
Al-Aqsa Mosque massacre - Oct 8, 1990⁣⁣
lbrahimi Mosque massacre - Feb 25, 1994⁣⁣
Qana massacre - April 18, 1996⁣⁣
Jenin massacre - April 3, 2002⁣⁣
Qana massacre - July 30, 2006⁣⁣
Gaza Strip massacre - August 5, 2022⁣⁣
Jenin massacre - January 26, 2023⁣⁣
Jenin massacre - July 3, 2023