After Allah had mentioned Ibrahim, the Friend of Allah, and commended him, he next mentioned Al-Kalim (the one spoken to by Allah directly). Allah said,
(And mention in the Book, Musa. Verily, he was Mukhlasan) Ath-Thawri reported from `Abdul-Aziz bin Rafi`, from Abu Lubabah that he said, "The Disciples (of `Isa) said, `O Spirit of Allah, inform us about the one who is Mukhlis (purely devoted) to Allah.' He said, `That is one who does a deed solely for Allah and he does not like for the people to praise him."' Others recited the word as Mukhlas, which means that he was chosen. This is as Allah says,
مِن جَانِبِ الطُّورِ الْأَيْمَنِ (The right side of the mount Tur - 19:52). This famous mountain (Tur or Sinai) rises in Syria between Madyan and Egypt, and is still known by the same name. Allah Ta’ ala has given it a distinct and special position in many ways.
الْأَيْمَنِ The position of Mr is given to .the right side in relation to Sayyidna Musa (علیہ السلام) who had commenced his journey from Madyan and when he approached Tur, it was on his right side. نَجِيًّا is for whisper, مُنَاجَات is for confidential talk and نَجِی means a confidant.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 50–52
Man is accustomed to living with his family and within his community. Under these circumstances, separating a man from his family and friends amounts to pushing him into an abyss of despair. But, through Abraham’s lot, God has made it clear for all time that a man who is rendered homeless purely for the cause of God shall have a far better abode bestowed upon him by His Creator. In the long run God, by His Grace, honours with fame and good fortune one who has been thrust into oblivion for His sake.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.