In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
The Messenger of Allaah [sallal laahu alayhi wasallam] said, “Haste is from shaytaan”. [Ref 1]
Shaikh Saaleh Al-Fawzaan [may Allaah preserve him] says:
[a] There should be no haste without a [good] reason.
[b] When one hastens to do something, he should be calm and composed lest he ends up not acquiring what he seeks to accomplish.
[c] Don’t hasten when pursuing affairs – either when passing judgements on things or statements -before contemplating [i.e. contemplation based on knowledge and not assumptions, guessing etc], because it maybe that you are the one who is mistaken.
[d] A person should not hasten to pass judgements, especially judgements related to the Sharee’ah- declaring something lawful or unlawful before contemplating or before passing judgements against the people and thus oppress them- this is wrong. Therefore, it is obligatory to take due care when pursuing affairs. Gentleness is not found in anything except that it beautifies it; so, do not hasten in pursuit of something [i.e. without a need and without contemplating].
Source: Listen to audio here:
[Ref 1:Tirmidhee 2012. Silsilah As-Saheehah] 1795]