﴿ هُوَ ٱلَّذِى يُسَيِّرُكُمْ فِى ٱلْبَرِّ وَٱلْبَحْرِ ۖ حَتَّىٰٓ إِذَا كُنتُمْ فِى ٱلْفُلْكِ وَجَرَيْنَ بِهِم بِرِيحٍۢ طَيِّبَةٍۢ وَفَرِحُوا۟ بِهَا جَآءَتْهَا رِيحٌ عَاصِفٌۭ وَجَآءَهُمُ ٱلْمَوْجُ مِن كُلِّ مَكَانٍۢ وَظَنُّوٓا۟ أَنَّهُمْ أُحِيطَ بِهِمْ ۙ دَعَوُا۟ ٱللَّهَ مُخْلِصِينَ لَهُ ٱلدِّينَ لَئِنْ أَنجَيْتَنَا مِنْ هَٰذِهِۦ لَنَكُونَنَّ مِنَ ٱلشَّٰكِرِينَ ﴾

“He it is who enables you to travel on land and sea. And [behold what happens] when you go to sea in ships: [they go to sea in ships,] and they sail on in them in a favourable wind, and they rejoice thereat until there comes upon them a tempest, and waves surge towards them from all sides, so that they believe themselves to be encompassed [by death; and then] they call unto God, [at that moment] sincere in their faith in Him alone, "If Thou wilt but save us from this, we shall most certainly be among the grateful!"”

�Then they pray to God, becoming sincere [in their] faith in Him�He [Sahl] said:Sincerity (ikhlāṣ) is witnessing (mushāhada). The life of the heart is in two things: in its root (aṣl) it is faith (īmān), and in its branch (farʿ) it is sincerity. Sincerity is a matter of great importance and the one who possesses it is wary lest his sincerity should not prevail till death, for actions are [judged] on the ones that come last � Worship your Lord, until what is certain comes to you [15:99]. His words, Exalted is He: