Deuteronomy 34:4

לאמר לזרעך אתננה הראיתיך TO SAY, TO THY SEED WILL I GIVE IT, I HAVE LET THEE SEE IT, i.e. in order that you may go and say to Abraham, to Isaac and to Jacob: The oath which the Holy One, blessed be He, swore to you — that oath He has fulfilled. This is the force of לאמר (Berakhot 18b), “to say it”, viz., that you may say it — for that reason have I let you see it. But it is a decree from Me that שמה לא תעבר THERE YOU SHALL NOT CROSS OVER; for were this not so, I would keep you alive even until you saw them planted and settled in it, and you would then go and tell them (the patriarchs).

וַיֹּ֨אמֶר יְהֹוָ֜ה אֵלָ֗יו זֹ֤את הָאָ֙רֶץ֙ אֲשֶׁ֣ר נִ֠שְׁבַּ֠עְתִּי לְאַבְרָהָ֨ם לְיִצְחָ֤ק וּֽלְיַעֲקֹב֙ לֵאמֹ֔ר לְזַרְעֲךָ֖ אֶתְּנֶ֑נָּה הֶרְאִיתִ֣יךָ בְעֵינֶ֔יךָ וְשָׁ֖מָּה לֹ֥א תַעֲבֹֽר׃

And the Lord said to him, This is the land which I swore to Avraham, to Yiżĥaq and to Ya῾aqov, saying, I will give it to thy seed: I have caused thee to see it with thy eyes, but thou shalt not go over there.