Ilā is interpreted in three ways:
1. The particle ilā is used in the sense of maʿa (together with); as in the following verses:
Do not consume their wealth with your own wealth [ilā amwālikum]; {that is, maʿa amwālikum: together with your wealth} do not consume it! (al-Nisāʾ 4:2)
So send for Hārūn {that is, send Hārūn together with me}! (al-Shuʿarāʾ 26:13)
{ʿĪsā said:} "Who are my helpers to Allah?" {that is, who are my helpers together with Allah?} (Āl ʿImrān 3:52)
A similar usage is found in Saff surah.
2. Ilā, with the initial alif, is also used in speech as a ṣila (a connecting particle with no additional meaning); as in the following verses:
He will gather you to the Day of Resurrection {that is, for the Day of Resurrection}. (al-Anʿām 6:12)
The phrase ilā yawm al-qiyāma (to the Day of Resurrection) means li-yawm al-qiyāma (for the Day of Resurrection), where the alif is a connecting particle (ṣila).
He will gather you to the Day of Resurrection {that is, for the Day of Resurrection}. (al-Nisāʾ 4:87)
The phrase ilā yawm al-qiyāma (to the Day of Resurrection) means li-yawm al-qiyāma (for the Day of Resurrection), where the alif is a connecting particle (ṣila).
Then He will gather you to the Day of Resurrection {that is, for the Day of Resurrection}. (al-Jāthiya 45:26)
The phrase ilā yawm al-qiyāma (to the Day of Resurrection) means li-yawm al-qiyāma (for the Day of Resurrection), where the alif is a connecting particle (ṣila).
3. Ilā is interpreted as qarāba (closeness, proximity); as in the following verses:
And We certainly sent Nūḥ to his people. (al-Muʾminūn 23:23)
It means "We sent him to them."
And to ʿĀd [We sent] their brother Hūd. (Hūd 11:50) And to Thamūd [We sent] their brother Ṣāliḥ. (Hūd 11:61)
There are many similar statements.