(Genesis 15:1) The seventh trial. "After these things the word of the LORD came to Abram" (Genesis 15:1). To all the prophets He appeared in a vision [chazon], but to Abraham He was revealed in both a sight [mar'eh] and a vision [machazeh]. From where do we know the sight? "And the LORD appeared to him" (Genesis 18:1). From where do we know the vision? "After these things the word of the LORD came to Abram in a vision [machazeh]" (Genesis 15:1). He said to him: "Abraham, do not fear, for I am a shield to you" (Genesis 15:1).
Abraham's Seventh Trial and the Vision Fear Not I Am Your Shield
Yalkut Shimoni on Torah 76:6
(בראשית טו א) הַנִּסָּיוֹן הַשְּׁבִיעִי. אַחַר הַדְּבָרִים הָאֵלֶּה הָיָה דְּבַר ה' אֶל אַבְרָם, לְכָל הַנְּבִיאִים נִרְאָה לָהֶם בַּחֲזוֹן, וּלְאַבְרָהָם נִגְלָה בַּמַּרְאֶה וּבַחֲזוֹן. בַּמַּרְאֶה מִנַּיִן, "וַיֵּרָא אֵלָיו". בַּחֲזוֹן מִנַּיִן, אַחַר הַדְּבָרִים הָאֵלֶּה הָיָה דְּבַר ה' אֶל אַבְרָם בַּמַּחֲזֶה. אָמַר לוֹ, אַבְרָהָם, אַל תִּירָא שֶׁאֲנִי מָגֵן לָךְ.