The Quran

وَقالَ يا بَنِيَّ لا تَدخُلوا مِن بابٍ واحِدٍ وَادخُلوا مِن أَبوابٍ مُتَفَرِّقَةٍ ۖ وَما أُغني عَنكُم مِنَ اللَّهِ مِن شَيءٍ ۖ إِنِ الحُكمُ إِلّا لِلَّهِ ۖ عَلَيهِ تَوَكَّلتُ ۖ وَعَلَيهِ فَليَتَوَكَّلِ المُتَوَكِّلونَ

Muhammad Asad

And he added: "O my sons! Do not enter [the city all] by one gate, but enter by different gates.¹Yet [even so,] I can be of no avail whatever to you against [anything that may be willed by] God: judgment [as to what is to happen] rests with none but God. In Him have I placed my trust: for, all who have trust [in His existence] must place their trust in Him alone."

Probably in order not to attract undue attention in the foreign land and possibly fall prey to intrigues. See in this connection note 68 below.