Prophet Muhammad (PBUH) said “if anyone loves their brother then he should let them know.” This is a forgotten sunnah. 

Loving someone in our heart is not enough this love should be expressed. Prophet Muhammad (PBUH) told us we should verbally express that love. 

What does it mean to love someone for the sake of Allah? This means that you love them for the goodness that is in them. It is the type of love that is tied in with your spirituality. Love and belief should be tied together.