Here are 3 Bible verses about the Holy Grail, curated from both the Old and New Testaments of the Holy Bible, King James Version, arranged from most to least relevant.
Revelation 1:1 KJV
1 The Revelation of Jesus Christ, which God gave unto him, to shew unto his servants things which must shortly come to pass; and he sent and signified it by his angel unto his servant John:
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John 5:37 KJV
37 And the Father himself, which hath sent me, hath borne witness of me. Ye have neither heard his voice at any time, nor seen his shape.
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1 Samuel 3:13 KJV
13 For I have told him that I will judge his house for ever for the iniquity which he knoweth; because his sons made themselves vile, and he restrained them not.