[15].Surah Al-Hjir [The Rocky Tract]: Ayat 1-2

Ayat 1. Alif-Lâm-Râ. [These letters are one of the miracles of the Quran, and none but Allah (Alone) knows their meanings]. These are the Verses of the Book, and a plain Qur'an.

Ayat 2. Perhaps (often) will those who disbelieve wish that they were Muslims [those who have submitted themselves to Allah's Will in Islam Islamic Monotheism, this will be on the Day of Resurrection when they will see the disbelievers going to Hell and the Muslims going to Paradise].

Hazrat Abu Musa Al-Ash`ari (May Allah be pleased with him) reported: The Messenger of Allah  [SAWW](PBUH) said, "Read the Qur'an regularly. By the One in Whose Hand Muhammad's soul is, it escapes from memory faster than a camel does from its tying ropes.''

[Al-Bukhari Book # 6 Chapter # 61 Hadith # 552]. 

Lesson : as mentioned above in Surah Al-Hjir Ayat 01. "These are the Verses of the Book, and a plain Qur'an," To safeguard the Qur'an means to recite it regularly, because if one fails to do so, he tends to forget it quickly. In the absence of regular recitation, one is bound to forget it more quickly than a camel breaks loose bound with. The breaking loose by the camel to liberate itself is a simile for the quick process of forgetting.