Were the 4 jhanas a unique discovery of the Buddha?

[Khemarato.bhikkhu]

There’s been lots of discussion on this forum about this before. The search icon above might be a good place to start

"The formless attainments are not included in the earliest teachings..."

Well, I don’t have a lot of details at hand, but I have heard arguments to the effect that: the arupas were taught by the Buddha’s former teachers, so they’re not really Buddhist. (Others argue that what they former teachers were teaching were not really arupas. Which is equally implausible.) the arupas are not in right samadhi (and the five faculties, etc.) As to the first argument, the former teachers first taught faith, energy, mindfulness, samādhi, and wisdom. So are we to argue that …

For example…