Verse 3:159 says that Allah loves those who put their trust in Him
Also, the verse gives some Golden recommendations that Allah gave His Prophet Muhammad in order to be the best leader.

The verse says:

It was by the mercy of God that you, Prophet Muhammad, were lenient with them, that you showed indulgence toward them when they disobeyed you;
Had you been harsh in speech,
Ill-natured, and fierce of heart,
Brutish and coarse towards them,
They would have dispersed, split away, from about you.
So pardon them, pass over what they have done,
Pardon your Companions for that which may ensue from them
And ask forgiveness for them, for their sins, until I forgive them,
And consult them; find out their opinions, in the matter,
Consult with them upon the conduct of affairs
In order to win their hearts over
And so that you may be emulated in this respect;
And indeed, the Prophet would frequently consult them.
And when you are resolved, to carry out what you wish after counsel, rely on Allah, put your trust in Him,
Put your trust in Allah to give you triumph and domination
For Allah loves those who rely on Him

Because the Prophet Muhammad has strictly followed all of these golden recommendations, and has completely put his trust in Allah, hence, He is the best leader ever walked on earth and Allah gave him triumph and domination.

Verse 3:159 in four different translations

QARIB:
It was by that mercy of Allah that you (Prophet Muhammad) dealt so leniently with them. Had you been harsh and hardhearted, they would have surely deserted you. Therefore, pardon them and ask forgiveness for them. Take counsel with them in the matter and when you are resolved, put your trust in Allah. Allah loves those who trust.

SHAKIR:
Thus it is due to mercy from Allah that you deal with them gently, and had you been rough, hard hearted, they would certainly have dispersed from around you; pardon them therefore and ask pardon for them, and take counsel with them in the affair; so when you have decided, then place your trust in Allah; surely Allah loves those who trust.

PICKTHAL:
it was by the mercy of Allah that thou wast lenient with them (O Muhammad), for if thou hadst been stern and fierce of heart they would have dispersed from round about thee. so pardon them and ask forgiveness for them and consult with them upon the conduct of affairs. And when thou art resolved, then put thy trust in Allah. lo! Allah loveth those who put their trust (in him).

YUSUFALI:
it is part of the mercy of Allah that thou dost deal gently with them wert thou severe or harsh-hearted, they would have broken away from about thee: so pass over (their faults), and ask for (Allah's) forgiveness for them; and consult them in affairs (of moment). Then, when thou hast taken a decision put thy trust in Allah. for Allah loves those who put their trust (in him).