Lord Krishna delivered divine teachings to Arjuna through Bhagavad Gita on the battlefield of Mahabharata war. Lord Krishna motivated His friend Arjuna to do his duty and also told him about deep relevance of devotional bhakti. Lord Krishna told Arjuna very deep message about his devotees. As per Him in Bhagwad Gita Chapter 9 :

"ananyas cintayanto mam

ye janah paryupasate

tesham nityabhiyuktanam

yoga-ksemam vahamy aham" (Bhagwat Gita: Chapter Nine verse 22)

"Sri Krishna said to Arjuna: But those who always worship Me with exclusive devotion, meditating on My transcendental form—to them I give what they lack in life, and I protect what they have."

"samo ’ham sarva-bhutesu

na me dvesyo ’sti na priyah

ye bhajanti tu mam bhaktya

"Sri Krishna said: I envy no one, nor am I partial to anyone. I am equal to all. But whoever renders service unto Me in devotion is a friend, is in Me, and I am also a friend to him."

"api cet su-duracharo

bhajate mam ananya-bhak

sadhur eva sa mantavyah

"Sri Krishna said: Even if one commits the most abominable action, if he is engaged in devotional service he is to be considered saintly because he is properly situated in his determination."

"ksipram bhavati dharmatma

sasvac-chantim nigacchati

kaunteya pratijanihi

"Sri Krishna said: He quickly becomes righteous and attains lasting peace. O Arjuna, declare it boldly that My devotee never perishes."

"man-mana bhava mad-bhakto

mad-yaji mam namaskuru

mam evaishyasi yuktvaivam

"Sri Krishna said: Engage your mind always in thinking of Me, become My devotee, offer obeisance's to Me and worship Me. Being completely absorbed in Me, surely you will come to Me."

So Lets become devotees of Lod Krishna so that He can bestow His mercy on us always.

Jai Sri Krishna