History of Hamas using Al-Shifa Hospital:

PBS documentary in Al-Shifa hospital was prevented by Hamas members with weapons from accessing areas of the hospital:

https://www.tabletmag.com/sections/news/articles/top-secret-hamas-command-bunker-in-gaza-revealed

Article from 2009 talking about an intelligence claim of Hamas using the basement of the hospital:

https://web.archive.org/web/20090206232152/http://haaretz.com/hasen/spages/1054569.html

Article Hamas commandeered hospital wards in Al-Shifa converting them into interrogation and imprisonment compounds:

https://web.archive.org/web/20230205050631/https://www.ynetnews.com/articles/0,7340,L-3668018,00.html

Human Rights Watch states Hamas fired from inside Al-Shifa at Fatah forces:

https://www.hrw.org/news/2007/06/12/gaza-armed-palestinian-groups-commit-grave-crimes

Report that Hospital staff made complaints about Hamas presence in the building:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1906608/

New York Times reported on Hamas operating from the building:

https://www.nytimes.com/2008/12/29/world/africa/29iht-gaza.4.18986499.html?module=Search&mabReward=relbias%3Ar

Journalists seeing rockets being fired from the hospital area:

https://web.archive.org/web/20230529141259/https://www.ynetnews.com/articles/0,7340,L-4553643,00.html

Another report of journalists seeing rockets fired from the hospital area:

https://web.archive.org/web/20230513143525/https://www.jpost.com///operation-protective-edge/gaza-reporters-tweets-hamas-using-human-shields-368689#!

A Hamas member recounting how he and other Hamas members took shelter in a bunker under the hospital:

https://www.terrorism-info.org.il/en/18321/

Local Palestinian journalist reported Hamas uses a section of the hospital for offices:

https://archive.ph/BKbxc

Amnesty International reported Hamas using the hospital to torture and kill prisoners:

https://www.amnesty.org/en/latest/news/2015/05/gaza-palestinians-tortured-summarily-killed-by-hamas-forces-during-2014-conflict/