"And We called him from the right side of the Mount," meaning the right side of the mountain. "And brought him near in secret," meaning: when He spoke to him.
Muhammad said: "Secretly," meaning: whispering/communicating privately.
﴿وَنَادَيْنَاهُ مِنْ جَانِبِ الطُّورِ الأَيْمَنِ﴾ أَيمن الْجَبَل ﴿وقربناه نجيا﴾ يَعْنِي: حِينَ كَلَّمَهُ.
قَالَ مُحَمَّدٌ: (نجيا) يَعْنِي: مناجيا.