Holy Quran, Chapter 70 Verse 44

خَاشِعَةً أَبْصَارُهُمْ تَرْهَقُهُمْ ذِلَّةٌ ذَلِكَ الْيَوْمُ الَّذِي كَانُوا يُوعَدُونَ

“With their eyes cast down, covered by disgrace. That is the day they have been promised!”

Imam Baqir (as)  explained the above verse by saying, “The day” refers to the day of the rising of the Qaem (as). (Taweel Al Ayat Al Zahirah page 701)

• Read More: Mahdi in the Quran