﴿ 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;”

Please check ayah 19:26 for complete tafsir.