Surah Maryam, verse 1

ذِكْرُ رَحْمَتِ رَبِّكَ عَبْدَهُۥ زَكَرِيَّآ ﴿٢﴾

[This is] a mention of the mercy of your Lord to His servant Zechariah

إِذْ نَادَىٰ رَبَّهُۥ نِدَآءً خَفِيًّۭا ﴿٣﴾

When he called to his Lord a private call [i.e., supplication].