Talmud zu Schemot 23:14

MISHNAH: All are obligated to appear¹To fulfill the biblical commandment to “be seen” before God on the occasion of the three festivals of pilgrimage which are called either steps (Ex. 23:17, Deut. 16:16) or walking occasions (Ex. 23:14, 34:23). The cases exempted from this biblical duty are defined in the Halakhah. except the deaf-mute, the insane, and the child, and the sexless, and the hermaphrodite, women, and unemancipated slaves, the lame, and the blind, and the sick, and the child, and anybody who cannot ascend on his feet. Who is a child? Any who cannot ride on his father’s shoulder from Jerusalem to the Temple Mount, the words of the House of Shammai. But the House of Hillel say, any who cannot hold on to his father’s hand and climb from Jerusalem to the Temple Mount, as it is said, three walking occasions²Ex. 23:14..