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San Remo Resolution - April 25, 1920
It was agreed -

(a) To accept the terms of the Mandates Article as given below with reference to Palestine, [...]

(b) that the terms of the Mandates Article should be as follows:

[...]
The High Contracting Parties agree to entrust, by application of the provisions of Article 22, the administration of Palestine, within such boundaries as may be determined by the Principal Allied Powers, to a Mandatory, to be selected by the said Powers. The Mandatory will be responsible for putting into effect the declaration originally made on November 8, 1917 [The actual date was November 2, 1917 - H.G.], by the British Government, and adopted by the other Allied Powers, in favour of the establishment in Palestine of a national home for the Jewish people, [...]

The terms of the mandates in respect of the above territories will be formulated by the Principal Allied Powers and submitted to the Council of the League of Nations for approval. [...]