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I.e., "under Our protection".
The messenger of Allah must strive his utmost to proclaim the Message of Allah: as for results, it is not for him to command them. He must wait patiently, in the knowledge that he is not forgotten by Allah, but is constantly under Allah's eyes,-under His loving care and protection. And he must glorify Allah's name, as he is a standard-bearer of Allah's Truth.
The translators and Commentators nearly all understand taqumu in the sense of rising up from sleep. But the rendering I have given is consistent with Quranic usage. In xxvi. 218, we have the same two words hina taqumu, meaning "standing forth (in prayer)". In lvii. 25, we have "li-yaqum an-nasu bil-qisti", which obviously means "that men may stand forth in justice," i.e., do all their business in justice. In lxxviii. 38, we have yaqumu used for the angels standing forth in ranks. On my rendering the meaning will be: 'celebrate Allah's praises when you stand forth in prayer, or at all times when you go about your business; but also for part of the night and at early dawn when worldly life is at a standstill.'