Samyutta Nikaya
While elements of the Satipathana sutta can be found in the Samyutta Nikaya and the Samyukta Nigama, which belong to the oldest strata of the Buddhist suttas, the elaborate Maha Satipatthana Sutta exists only in the Theravada Digha Nikaya. Bhante Sujato postulates that the sutta was compiled from elements from other suttas as late as 20 BCE.