Al-Awzai was asked about Khushu’ [1] in Salah?

So he said:

[It is] Lowering of the Gaze, lowering of the wing [in humility and humbleness], and softness of the Heart, and it is [a feeling of] sadness and fear [2].


[1] i.e. presence of the heart and mind in Salah

[2] Siyar A’laam Al-Nubalaa 7/116

سئل الاوزاعي عن الخشوع في الصلاة، قال: غض البصر، وخفض الجناح، ولين القلب، وهو الحزن والخوف.ـ