Which is better – devoting oneself to da’wah or seeking knowledge?

Dear Brothers & Sisters,
As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
Which is better – devoting oneself to calling others to Allaah (da’wah) or devoting oneself to seeking knowledge?
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Answer:

Praise be to Allaah.

Seeking knowledge is better and is preferable, but the seeker of knowledge may call people to Allaah whilst he is also seeking knowledge, but it is not possible to call people to Allaah when one has no knowledge. Allaah says (interpretation of the meaning):

“Say (O Muhammad): ‘This is my way; I invite unto Allaah (i.e. to the Oneness of Allaah — Islamic Monotheism) with sure knowledge…”

[Yoosuf 12:108]

How can there be da’wah with no knowledge? No one ever called anyone to Allaah without having knowledge; whoever calls people without knowledge will not be helped by Allaah.

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.
Your brother and well wisher in Islam

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