Jareer reported: The Messenger of Allah, peace and blessings be upon him, said:

مَنْ يُحْرَمْ الرِّفْقَ يُحْرَمْ الْخَيْرَ

He who is deprived of kindness is deprived of goodness.

Source: Sahih Muslim 2592, Grade: Sahih
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Abu Ad-Darda reported: The Prophet, peace and blessings be upon him, said:

مَنْ أُعْطِيَ حَظَّهُ مِنْ الرِّفْقِ فَقَدْ أُعْطِيَ حَظَّهُ مِنْ الْخَيْرِ وَمَنْ حُرِمَ حَظَّهُ مِنْ الرِّفْقِ فَقَدْ حُرِمَ حَظَّهُ مِنْ الْخَيْرِ

Whoever is given his portion of kindness has been given his portion of goodness, and whoever is deprived of his portion of kindness has been deprived of his portion of goodness.

Source: Sunan At-Tirmidhi 2013, Grade: Sahih

http://abuaminaelias.com/allah-loves-gentleness-in-all-things/