Das Satipatthana-Sutta gilt als die Meditationsanleitung des Buddha.
Als Meditationsanleitung des Buddha würde ich eher das Anapanasati-Sutta (MM 118) sehen. Das Satipatthana-Sutta soll laut beispielsweise Bhikkhu Sujato und Bhikkhu Buddhadasa erst nach Lebzeiten des Buddha verfasst worden sein.
Did the Buddha himself utter the Satipaṭṭhāna Sutta?
It seems unlikely. The Satipaṭṭhāna Sutta is only found in the “middle length” collection, the Majjhima Nikāya, although the “long text” collection, Digha Nikāya, contains an identical version augmented by a sprawling exposition of the Noble Truths that has obviously been grafted onto it from another well-known source. Thus, it should not surprise anyone too much that the Satipaṭṭhāna Sutta is a pastiche in other significant ways as well. The evidence suggests that it was patched together from shorter passages to create an anthology text—very useful for spreading the dharma to farflung sanghas like Kammāsadhamma, its purported setting. This area, in the Kuru country near modern Delhi, eventually became a stronghold of the Sarvāstivādan school, but at the time of the Satipaṭṭhāna Sutta’s composition was probably too distant from the Buddha’s original centers to possess very many remembered texts.