Pāṇasutta

sn46.11:1.1 “Mendicants, whatever living creatures engage in the four postures—

sn46.11:1.2 sometimes walking, sometimes standing, sometimes sitting, sometimes lying down—all do so depending on the earth and grounded on the earth.

sn46.11:1.3 In the same way, a mendicant develops and cultivates the seven awakening factors depending on and grounded on ethics.