Quran : Tafsir Ibn Kathir :
Trust in Allah After Taking the Decision

Allah's statement,

(Then when you have taken a decision, put your trust in Allah,) means, if you conduct the required consultation and you then make a decision, trust in Allah over your decision,

(certainly, Allah loves those who put their trust (in Him)).

Allah's statement,

(If Allah helps you, none can overcome you; and if He forsakes you, who is there after Him that can help you And in Allah (Alone) let believers put their trust), is similar to His statement that we mentioned earlier,

(And there is no victory except from Allah the Almighty, the All-Wise) ﴿3:126﴾.

Allah next commands the believers to trust in Him,

(And in Allah (Alone) let believers put their trust).