rg-vedo ‘tha yajur-vedah
sama-vedo ‘py atharvanah
adhitas tena yenoktam
harir ity aksara-dvayam
“A person who chants the two syllables ha-ri has already studied the four Vedas-Sama, Rg, Yajur and Atharva.”
Quoted in Srila Prabhupada’s purport to Sri Caitanya-caritamrta Adi-lila 7.72