﴿ فَنَادَىٰهَا مِن تَحْتِهَآ أَلَّا تَحْزَنِى قَدْ جَعَلَ رَبُّكِ تَحْتَكِ سَرِيًّۭا ﴾

“Thereupon [a voice] called out to her from beneath that [palm-tree]: "Grieve not! Thy Sustainer has provided a rivulet [running] beneath thee;”

Then he called her from below her namely Gabriel — for he was lower than her ‘Do not grieve. Your Lord has made below you a rivulet a river of water which had dried up.