There is no verified evidence that Turkey has officially declared readiness to launch a full-scale war against Israel; while Turkish leaders have issued strong rhetoric criticizing Israel and expressing support for Palestine, official statements emphasize de-escalation rather than war.
Turkey declares it is ready to launch a full-scale war against Israel, saying it will fight for the sake of Palestine

Turkey's Erdogan appears to issue open threat to invade Israel over war in Gaza - The Times of Israel
Source: timesofisrael.com
Key Evidence
clarifies that Erdogan did not say war on Israel is the only option.
misbar.commisbar.comTurkey Did Not Say War on Israel Is the Only Option for Humanity
notes Erdogan's apparent threat but does not confirm a formal declaration of war.
timesofisrael.comtimesofisrael.comTurkey's Erdogan appears to issue open threat to invade Israel over war in Gaza
states Turkey is ready to help de-escalate the conflict, indicating a preference for reducing tensions.
hindustantimes.comhindustantimes.comTurkey says it is ready to help de-escalate Israel-Palestine conflict
What the Evidence Shows
The claim that Turkey declared it is ready to launch a full-scale war against Israel is not supported by credible evidence from the provided sources.
explicitly refutes a similar claim circulating on social media that Turkish President Erdogan said war on Israel is the only option, clarifying that such statements were misrepresented or exaggerated.misbar.commisbar.comTurkey Did Not Say War on Israel Is the Only Option for Humanity
reports that Erdogan appeared to issue a strong threat to invade Israel over the Gaza conflict, but this is characterized as an "apparent" threat rather than an official declaration of war readiness. The language used is more rhetorical and political posturing than a formal military declaration.timesofisrael.comtimesofisrael.comTurkey's Erdogan appears to issue open threat to invade Israel over war in Gaza
and indicate that while Turkey supports Palestinians and criticizes Israel, Turkish officials have expressed willingness to help de-escalate the conflict rather than escalate it militarily.dw.comdw.comIran-Israel: Will Turkey get involved?
hindustantimes.comhindustantimes.comTurkey says it is ready to help de-escalate Israel-Palestine conflict
and (YouTube videos) show strong verbal attacks from Turkish officials against Israel, but these do not constitute formal declarations of war; such media content can sometimes amplify rhetoric for effect.youtube.comyoutube.com'Time For Action': Turkey DECLARES War On Israel, Tells Muslim Nations To Join...
m.youtube.comm.youtube.com'Time For Action': Turkey DECLARES War On Israel, Tells
and discuss the tense and deteriorating relations between Turkey and Israel, including warnings of possible conflict, but do not confirm any actual military mobilization or official war declarations.fpif.orgfpif.orgThe Shadow War between Turkey and Israel
wsws.orgwsws.orgErdoğan warns of war between Israel and Turkey
Overall, the evidence suggests Turkey is vocally critical of Israel and supportive of Palestine but stops short of committing to full-scale war. The claim in the input overstates the situation based on available information.
Given the complexity of regional geopolitics and the lack of official Turkish government confirmation, this claim should be treated as misleading or exaggerated rhetoric rather than fact.