עַ֣ד מִֽמָּחֳרַ֤ת הַשַּׁבָּת֙ הַשְּׁבִיעִ֔ת תִּסְפְּר֖וּ חֲמִשִּׁ֣ים י֑וֹם וְהִקְרַבְתֶּ֛ם מִנְחָ֥ה חֲדָשָׁ֖ה לַיהוָֽה׃
even unto the morrow after the seventh week shall ye number fifty days; and ye shall present a new meal-offering unto the LORD.
Read kabbalistic (mystical) interpretation of Leviticus 23:16: and classical mystical sources.