וְהִתְבָּרֲכ֣וּ בְזַרְעֲךָ֔ כֹּ֖ל גּוֹיֵ֣י הָאָ֑רֶץ עֵ֕קֶב אֲשֶׁ֥ר שָׁמַ֖עְתָּ בְּקֹלִֽי׃
Semua bangsa di bumi akan memberkati diri mereka dengan keturunanmu, karena engkau telah menaati suara-Ku.”
The Midrash of Philo
Why did Abraham appear to hesitate about the promise, for the sacred writer says, He said in his mind, shall there be a son to one who is a hundred years old; and shall Sarra, who is ninety years old, bring forth a child? (Genesis 22:18).