"Blessed be Abram of God Most High, possessor of heaven and earth" (Genesis 14:19). There are three acquisitions [that God calls His own]. Torah is one acquisition, as it is written, "The LORD acquired me as the beginning of His way" (Proverbs 8:22). Heaven and earth are one acquisition, as it is written, "possessor of heaven and earth" (Genesis 14:19). Israel is one acquisition, as it is written, "until the people You acquired pass over" (Exodus 15:16).
The Three Possessions the Holy One Calls His Own
Yalkut Shimoni on Torah 74:3
בָּרוּךְ אַבְרָם לְאֵל עֶלְיוֹן קוֹנֵה שָׁמַיִם וָאָרֶץ. שְׁלֹשָׁה קִנְיָנִין הֵן תּוֹרָה קִנְיָן אֶחָד, דִּכְתִיב, (משלי ח, כב) "ה' קָנָנִי רֵאשִׁית דַרְכּוֹ" שָׁמַיִם וָאָרֶץ קִנְיָן אֶחָד, דִּכְתִיב קוֹנֵה שָׁמַיִם וָאָרֶץ. יִשְׂרָאֵל קִנְיָן אֶחָד, "עַד יַעֲבֹר עַם זוּ קָנִיתָ".