佛祖  / fó zǔ /
Buddhas 
Category:
Buddhist Terminology 佛學名相
Description:
莫問西來及與東,焉知佛祖一空同。 四維上下皆如是,爭奈凡愚執相容。
Do not ask whether from the West or the East;
Emptiness is the same among buddhas.
Thusness in the four directions, top, or bottom;
Only the ordinary and ignorant cling onto existence.
References:
星雲大師全集【書法類】中華文化佛教名詞 名相 The Complete Works of Venerable Master Hsing Yun: Calligraphy-Terminology 
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